Make #install the default action
Remove unnecessary comment
Add bash completion script and note to README
Add debugging output
Merge pull request #336 from sethvargo/336_default_action

Like bundler, berks should default do berks install
Merge pull request #337 from sethvargo/337_bash_completion

Bash completion for cookbooks
Merge pull request #360 from sethvargo/berkshelf_debug

Add debugging output