wip: use env-var (session secret)
wip: repository[ref]
wip: repository: spec: add tests
wip: repository_ref: re-implement
wip: repository_ref: spec: add tests
wip: repository_ref: add comment
wip: repository_helper: remove helper functions
wip: repository: add add_refs()
wip: dependencies_controller: remove refs' dependencies
wip: repositories_controller: stop resolving refs' dependencies
wip: repository: spec: add tests for add_refs()
wip: repositories_controller: spec: rewrite tests
wip: repositories_controller: spec: mkdir_p tmp_repo_path