Merge pull request #450 from jithinjosepkl/pr/devel

Completions for inject operations
- Clean-up atomics code
- Fix an issue with atomic_op recv.

Signed-off-by: Jithin Jose <jithin.jose@intel.com>
Fix warnings with gcc 4.9.2

Signed-off-by: Jithin Jose <jithin.jose@intel.com>