Update for new autojump path
Switch from rbenv to chruby
Remove git remote URL mappings
Run `bundle check` and fallback to `bundle install` if needed

`bundle check` gives terser output, which is nice.
Enable prettiness for BSD `ls`
Add direnv as a more general replacement for rbenv-vars
Don't trample over PROMPT_COMMAND
Replace autojump with z
Add Brewfile for installing stuff with Homebrew
Ensure ~/bin takes priority in PATH
Silence direnv's loading/export/unloading messages
Remove unused vim colorschemes
Add directory diff tool for vim
Change `gemdiff` to use DirDiff.vim instead of Changes.app
Ignore input starting with spaces in addition to duplicate input
Add `gblg` to show `glg`-like output for the branch
Add psql alias to list all database sizes
Automatically use expanded output for wide output
Increase verbosity of error messages