Allow user to select what to compare against for #104
Rerun git gutter after compare against changes
Don't ignore all inserted lines when showing_unracked is on

This makes files that were not tracked at the commit GitGutter is comparing against correctly show all lines as new
Add menu items for selected/showing what to compare against
Add compare commands to sublime command palette
Add ability to chose a tag to compare against
Dry up the compare commands
Clear git cache when changing compare against
Remove trailing comma in JSON
Fix typo
Handle no tags in repository better
Merge pull request #121 from jisaacks/compare

Add ability to compare against an alternative commit/branch instead of HEAD