Created interfaces for Git client
Moved comments to interface
Created mock classes for git client interfaces
Repositories interface was package protected by accident
Merge pull request #20 from JWGmeligMeyling/mock-client

Created interfaces for Git client
Merge mock-client branch into master
Merge https://github.com/devhub-tud/git-server

Conflicts:
	git-client/src/main/java/nl/tudelft/ewi/git/client/Repositories.java