Source a secrets file which contains any sensitive exports for ZSH
Add more work/ruby related aliases, add heroku toolbelt, remove forced ruby 2.0

Add:
 * Aliases for 'bundle install' and 'bundle update'
 * Aliases for pretty printing json, and querying airbrake

Remove:
 * Forced ruby 2.0.0
Add Vim mode to ZSH, include OPP to ZSH (Vim text objects)