pullrequests: refactor PullRequestModel().create The database lookups of the user and repositories are moved outside, into the callers, which have already looked up the relevant objects, thus saving two database lookups when creating a PR.

pytest>=2.7.0,<4.0
pytest-runner
pytest-sugar>=0.7.0
pytest-catchlog
WebTest<2 # this is also a Pylons dependency and pinned in setup.py to avoid version conflicts for WebOb
mock
sphinx