added brewed pkg-config to linux install. fixed/added user, group, rootuser, rootgroup variables in config.rb object, and added corresponding boxen_xxx variables to facter. reenabled everying in site.pp that's enabled in vanilla boxen, starting the process of smoothing out related bugs
All of the default ruby-builds now work completely on both OSX and Ubuntu14. On Ubuntu there's a crazy readline error for ruby 2.x.x (before 2.1.2) that you have to fix with a diff patch. I automated that
Merge branch 'add-linux-support' of github.com:telamonian/our-boxen into add-linux-support

Conflicts:
	README_LINUX.md