Heavy code refactoring to remove a lot of code in collectives (~1000 lines).

Have all collectives use the same args, the same ring, and the same primitives for synchronization between threads with the same pattern.

src/copy_kernel.h

@@ -1,7 +1,7 @@
 /*************************************************************************
  * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
  *
- * See LICENCE.txt for license information
+ * See LICENSE.txt for license information
  ************************************************************************/