Get the branching model for a repository

Return the branching model as applied to the repository. This view is read-only. The branching model settings can be changed using the settings API.

The returned object:

1. Always has a development property. development.branch contains the actual repository branch object that is considered to be the development branch. development.branch will not be present if it does not exist.
2. Might have a production property. production will not be present when production is disabled. production.branch contains the actual branch object that is considered to be the production branch. production.branch will not be present if it does not exist.
3. Always has a branch_types array which contains all enabled branch types.