Passing ?branch=<branch-name> will use the specified branch instead of
master.
The new branch will not exist until a /recipes/new?branch=new-branch
POST is made. At that time the branch will be created based on the
current master branch and the new commit will be added to it.
- Fix `projects_depsolve()` to not consider a successful empty response
(rc == 0) as an error.
- Fix recipe_from_dict() to default modules and packages to empty lists
instead of `None`, to avoid a Python-ism in the API for consumers and
stay compatible to the bdcs API.
Fixes#290
Recipe should have its version bumped based on the version from the
previous commit, and not be bumped on the first commit. Fix the code and
the tests.
