Release candidate for version 2.0.0

* Added rspec-test suite
* Added code coverage analyzis
* Unified classes interface
Change github repository URL

* Old URL was https://github.com/ccin2p3/puppet-ccin2p3-remctl
* New URL is https://github.com/ccin2p3/puppet-remctl
Official release for v2.0.0

* Fix small typo in README.md
* Add detailed release procedure for this module
* Update CHANGELOG and Modulefile