Switched to implementations for the git client interfaces
Started work on a webdriver test suite.
Now using mocked LdapBackend for authentication when testing.
Merge pull request #30 from JWGmeligMeyling/view-file

Added a resource to view files at a certain commit
Merge pull request #27 from JWGmeligMeyling/mock-client

Switched to implementations for the git client interfaces
Merged master into webdriver-tests branch.
Merge pull request #34 from devhub-tud/webdriver-tests

Added an initial setup for WebDriver tests.
Merge https://github.com/devhub-tud/devhub into view-file