[FEATURE] Git\Mercurial Branch Creation

[galvinograd]

We are working according to gitflow methology, and therefore we must create a new branch for each release.

I suggest to implement the following mechanism: Adding two new parameters:

• "branch" - a flag that tells if a branch should be created (similar to "tag" or "commit"). This flag will require the presence of the commit flag.
• "branch_name" - a string parameter that describes the desired name of the branch (similar to "tag_name").

I think many users will benefit from this feature. As a side note, I have not problem implementing it :)

[peritus]

Sorry, this is outside of the scope of this project.

Bumpversion aims to bump versions, not to become a second gitflow implementation.