Boostrap first tests
Fix travis conf
Update travis conf
Add tests for RepositoryConfigurationLoader
Refactor Node::getReducedTree and add tests for Node
Add tests for Repository
Add tests for Session
Add tests for RepositoryLoader
Add tests for RepositoryManager
Add tests for WorkspaceManager
Add tests for SessionManager
Add tests for NodeManager
Add travis build status into README
Update composer.json
Merge pull request #7 from marmelab/tests

[RFR] Add tests