git kill branchname

@charlierudolph Aaaaahhhh, for some reason some commits meant for this PR ended up in an already merged PR. I was messing around with `git extract` while being distracted on the resource planning call, so that's my (super lame) excuse... Anyways, please take a look at https://github.com/Originate/git-town/commit/738e3e76158a4803c5695abf71349b21d02033f5, and comment there. I will implement the corresponding fixes in this pull request, and once this gets merged its all going to be kind of okay again...  :smile: 
Sorry typo.`$initial_branch_name` should be `$initial_open_changes`. 
If commit_open_changes becomes the following:
```sh
function commit_open_changes {
  if [ $initial_open_changes = true ]; then
    run_command "git add -A"
    run_command "git commit -m 'WIP on `get_current_branch_name`'"
  fi
}
```

Then the check in here about `$initial_open_changes`, can be removed.