message: create feature branch xxx (from None)

[tuan-tu-tran]

When we create a feature branch without specifying the base, it should not say (from None) but the real branching point

user@host ~/workdir $ git flow feature start 114_split_buttons
create feature branch 114_split_buttons (from None)

Summary of actions:
- A new branch feature/114_split_buttons was created, based on None
- You are now on branch feature/114_split_buttons

Now, start committing on your feature. When done, use:

     git flow feature finish 114_split_buttons

[webmaven]

:+1: