Change of Swipe-Framework Git Branch

This commit changes the branch of the swipe-framework project that is
cloned through git to a branch called 'salt'. This branch was recently
created to be compatible with the saltstack config, which is now
handling files that were included in other branches of the git project.
Ruby Gems Handled Through Gemfile

This changes the way that Ruby gems are installed in the ruby state. It
appears that RVM and the gems for the project were being installed
globally. This now installs a Gemfile that should handle the
installation, which was moved to salt from the swipe-framework git
project and is handled through the project's fabfile.
Fix For Nginx Script Dependencies

This adds the two git modules that are compiled with nginx as
requirements for the script that does the compiling. This was causing
the script fail when run through salt previously.