Enhancement: Squash in rebase dashboard now behaves like `git rebase -i`.
Enhancement: Squash in rebase dashboard now behaves like `git rebase -i`.

Closes #301.

stoivo/GitSavvy,stoivo/GitSavvy,divmain/GitSavvy,ddevlin/GitSavvy,asfaltboy/GitSavvy,asfaltboy/GitSavvy,divmain/GitSavvy,ddevlin/GitSavvy,stoivo/GitSavvy,divmain/GitSavvy,ddevlin/GitSavvy,asfaltboy/GitSavvy