adding encryption capabilities for encryping data sent to the
credential store.
code cleanup, reducing exceptions.
Merge remote-tracking branch 'origin/develop' into feature/encryption-utilities

Conflicts:
	coopr-server/src/main/java/co/cask/coopr/store/credential/MemcachedCredentialStore.java
copyright update.
Merge pull request #460 from caskdata/feature/encryption-utilities

adding encryption capabilities for encryping data sent to the