ONOS-533 Fix copyrights

- Any files created in 2014 and modified in 2015 got a copyright of
  2014-2015
- Used canonical form of 2014-2015 to be inclusive of extra years.
  Some files had 2014,2015

Change-Id: If9a133618873e4000b8f10299bde7c870eb1fbd5
diff --git a/core/store/dist/src/main/java/org/onosproject/store/group/impl/package-info.java b/core/store/dist/src/main/java/org/onosproject/store/group/impl/package-info.java
index 603712f..35e3b25 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/group/impl/package-info.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/group/impl/package-info.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Open Networking Laboratory
+ * Copyright 2014-2015 Open Networking Laboratory
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,4 +16,4 @@
 /**
  * Implementation of the group store.
  */
-package org.onosproject.store.group.impl;
\ No newline at end of file
+package org.onosproject.store.group.impl;