Fixed a template for plain rendering (compute)
Move code into separate cli directory

* Code refactoring
* Separate Occi::Cli version
* Updated tests
Removed legacy options

* --proxy-ca is no longer needed
* option to directly set Keystone token removed
Fixed Travis-CI (build deps)
Merge pull request #2 from arax/refactoring

Refactoring; minor fixes in rendering and options