(WIP) basic feature command

@evansde77 

Not sure what's the best way to go about testing this. Just have very basic commands to update local develop branch and create a new feature branch.
here is some work in progress: 
https://gist.github.com/evansde77/68f3d5de6f5743908f67

We probably want some general functions for checking out develop, creating feature or release branches etc