Refactor Staging

[techman83]

This should address most of the issues we see with staging and allow us to follow our regular practice of removing branches that get merged.

Additions

• Adds testing function to remove remote branches
• Adds test for when a remote branch doesn't exist, but exists locally

Fixes

• Staged ckans that are updated multiple times, but have yet to be merged into master
• Exceptions from files that have no changes and don't require a commit are ignored

[coveralls]

Coverage increased (+0.1%) to 91.631% when pulling 1f2b092 on techman83:85_86_staging_fixes into 1384ac2 on KSP-CKAN:master.

[HebaruSan]

Is this fixing #85 and/or #86?

Never mind, the comments make clear that it is.

[HebaruSan]

I honestly can't keep the problems or solutions straight in my head here, but I don't have changes to suggest, so it doesn't make sense to hold this up. At worst we can continue to iterate on this as necessary.

[techman83]

That's fair 🙂 It was mostly to catch anything silly as it was a 2 hour sprint after a full days work. Also so that someone other than me has at least seen under the covers.