Add support for changing prefix

[rizken]

As a user I want to be able to add other prefixes than feature so that I can use this for more use cases

Acceptance criteria

• it should enable provision for a prefix argument
• it should be able to create a hotfix branch
• it should be able to create a bugfix branch
• it should be able to create release branch
• it should be able to create a custom prefix

[bjornet]

AC in this ticket is a bit hard to understand (I think there has been some copy/pasta). Plz have another go at it.