(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.
yeah, I think we could pull out the first part of the function in that gist as a checkout_and_pull(repo, branchname) function so that we can do checkout_and_pull(repo, "develop") to get the latest develop

Then build other functions around that