adding cli functionality for stash files
Delete bob.rb

accidentally added to commit.
saving to dropbox
Added stash class for subcommands, so the cli now has stash apply and stash save for working with stash files. Also added stash list command to retrieve list of all stash files.
Merge branch 'master' into add_stash
Merge branch 'add_stash' of http://github.com/kevinml/exercism into add_stash
Merge pull request #71 from kevinml/add_stash

Adding CLI functionality to stash submissions for later use