Enable third party contributions

- Add instructions for contributing to ARM Trusted Firmware.

- Update copyright text in all files to acknowledge contributors.

Change-Id: I9311aac81b00c6c167d2f8c889aea403b84450e5
diff --git a/include/aarch64/arch.h b/include/aarch64/arch.h
index 055a745..143dc6c 100644
--- a/include/aarch64/arch.h
+++ b/include/aarch64/arch.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/aarch64/arch_helpers.h b/include/aarch64/arch_helpers.h
index 9dc6b92..85c0481 100644
--- a/include/aarch64/arch_helpers.h
+++ b/include/aarch64/arch_helpers.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/asm_macros.S b/include/asm_macros.S
index f7afdfc..0067ca6 100644
--- a/include/asm_macros.S
+++ b/include/asm_macros.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/bakery_lock.h b/include/bakery_lock.h
index 6c4ab8f..76ef6d9 100644
--- a/include/bakery_lock.h
+++ b/include/bakery_lock.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/bl1.h b/include/bl1.h
index 868ee4f..81b5bc4 100644
--- a/include/bl1.h
+++ b/include/bl1.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/bl2.h b/include/bl2.h
index 6fa8721..3981a86 100644
--- a/include/bl2.h
+++ b/include/bl2.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/bl31.h b/include/bl31.h
index 0d123a4..dbf7e5a 100644
--- a/include/bl31.h
+++ b/include/bl31.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/bl_common.h b/include/bl_common.h
index 58accdb..3504d04 100644
--- a/include/bl_common.h
+++ b/include/bl_common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/mmio.h b/include/mmio.h
index ecc1f87..53f7e31 100644
--- a/include/mmio.h
+++ b/include/mmio.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/pm.h b/include/pm.h
index 7a4ef8b..24e080b 100644
--- a/include/pm.h
+++ b/include/pm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/psci.h b/include/psci.h
index f63e32c..e5eb997 100644
--- a/include/psci.h
+++ b/include/psci.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/runtime_svc.h b/include/runtime_svc.h
index ea6accb..3ccbe88 100644
--- a/include/runtime_svc.h
+++ b/include/runtime_svc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/semihosting.h b/include/semihosting.h
index b56ff2f..b7fbddb 100644
--- a/include/semihosting.h
+++ b/include/semihosting.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
diff --git a/include/spinlock.h b/include/spinlock.h
index 9cc261f..7436664 100644
--- a/include/spinlock.h
+++ b/include/spinlock.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, ARM Limited. All rights reserved.
+ * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met: