adding docs for REST APIs for managing services and cluster config.
fix some formatting.
Merge remote-tracking branch 'origin/develop' into feature/document-service-apis

Conflicts:
	docs/docs/source/rest/services.rst
consistency with capitalization, adding some more details, and
fixing warnings.
Merge pull request #104 from continuuity/feature/document-service-apis

adding docs for REST APIs for managing services and cluster config.