Updated syntax for setting user variable (Sprinkle 0.7.2)
Update install.rb to ensure database installed before Web Development
Big improvements to rails package.

  * Correctly verify existence of rails mysql user.
  * Correctly verify existence of rails app databases.
  * Changed Vagrantfile to example format.
Update Readme.
Added sprinkle provisioning config to example Vagrantfile.
Move ruby-specific mysql driver to rails-development.
Added dev_essentials package for vim, ack-grep, etc.

  * Add fix to mysql to ensure service is running.
Remove redundant 2222 port forward.
Tweak service start for mysql.
Merge updates from master and tweak.