Increase coverage for tests

Version 2 implemented (#6)

* New V2 version of Gongular

* Added error checks as well

* Removed the accidental DS_Store :(

* Removed go1.6 from tests

* more readme

* Changed the package name from gongular2 to gongular

* Added single file sender

* Readme extended

* Added websocket documentation

SetErrorHandler added.