CK now has continuous intergration via Travis and AppVeyour
Changes:
- added continuous integration via Travis (Linux) and AppVeyor (Windows)
- added CoverAlls to measure test coverage
- added possibility to skip listing of all modules from private repositories
- fixed error in 'ck edit'
- unitests added (we now support Python 2.7 and 3.3+)
- added 'dump_json' instead of 'dumps_json'