Add descriptive error message to update-jekyll-history if no arg given

Maybe it's just me, but I've always found quiet quits kind of unhelpful. This adds an error message for you just in case you are drinking heavily or something and merging PRs. It's a thing.
Merge pull request #1 from parkr/patch-1

Add descriptive error message to update-jekyll-history if no arg given
Use 256 colors all the time
add a vim plugin for elixir
don't complete uninteresting users
add aliases for bundler
steal a bunch of completion plugins from oh-my-zsh
remove vim-rspec
Replace zencoding-vim with emmet-vim
update submodules
fix whitespace
Use Ag instead of Ack
initial config for slate
Replace a bunch of vim plugins
fix bug
Remove .xinitrc since I don't use Linux on the desktop
Updates to my Slate configuration
Customize airline
Nuke RVM in favor of rbenv
complete the switch to rbenv