COOPR-510: Added unit tests; Refactored AdminRestClient; Added README.md file with documentation to the rest-client.
COOPR-510: Removed unused constants.
Merge branch 'develop' into feature/rest-client
COOPR-510: Refactored, according to review comments.
Merge branch 'develop' into feature/rest-client
Merge branch 'develop' into feature/rest-client

Conflicts:
	coopr-rest-client/src/test/java/co/cask/coopr/client/rest/RestClientTest.java
Resolved compilation errors after merge with develop branch; Added https unit tests for Provisioner and Tenant rest clients.
Merge pull request #674 from cybervisiontech/feature/rest-client

Feature/rest client