Add syntax highlighting to certain file types

* Syntax highlight `Appraisals` as Ruby. Used especially for our open
  source libraries.
* Syntax highlight rackup (`config.ru`) files as Ruby. Used in all our
  Ruby web apps. Rails apps are rarely touched but some of the Sinatra
  and Middleman apps are occasionally edited.
* Syntax highlight JSON files as JavaScript. Used in our Trail Map.
Adds local configuration for bundles
Updates dotfiles to have .local files as needed

* in favor of the old way of #DO NOT EDIT BELOW THIS LINE, dot files
* were changed to have local config files - updates local dotfiles ot
* match this preferred pattern
Adds git plugin back for git branch auto completions
Load RVM
Color and alias tweaks
Adds mysql back into path