[cdap-597] http-sync dependency removed
[cdap-597] Readme improvements.
[cdap-597] browser unit tests improved for asynchronious mode.
[cdap-597] changes on PR comments.
[cdap-597] errors` texts correction.
[cdap-597] Readme changes
[cdap-597] Readme: duplicated section "Supported actions" removed
[cdap-597] promise improvements
Merge pull request #66 from cybervisiontech/cdap-597

[cdap-597] http-sync dependency removed