iTerm2: updated tmux profile
Added `relogin!` alias for reloading zsh entirely
Merge master branch into mac
sublime2: updated preferences
iterm2: renamed directory
sublime2: update to preferences
sublime2: added whitespace settings
sublime2: symlink everything from Packages/

Used submodules so that Git manages ST2 plugins, and then symlinked
those submodules to ST2's Packages/ directory.
sublime2: `copy` is not needed
zsh: `relogin!` is no longer needed
sublime2: set tab size to 2
sublime2: added Cucumber package
zsh: fix Ruby version in prompt
Merge master into mac