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: 
Two reasons: 

1) This isn't a real sentence, so it shouldn't end with a period. It's merely a concise message.

2) Robust feature specs don't enforce punctuation, for exactly that reason: punctuation is debatable. All that the spec cares about is that the correct error message is displayed, not how it is formatted in detail. We don't want specs to fail everytime a message formatting detail is changed.