git-authoract: Remove empty months from start and end

1ac3dd26-2531-11e4-a248-c80aa9e67bbd
Merge branch 'add-git-authoract'

* add-git-authoract:
  git-authoract: Remove empty months from start and end
  git-authoract: Include months with no commits
  git-authoract: Define and use $outfile
  git-authoract: New script for plotting out authors per month

75e4e7e0-2531-11e4-8574-c80aa9e67bbd