Added variable to set if site is responsive
Made grid more flexible and user friendly
Added mixin to test if retina screen and added it to the load sprite mixin if site is responsive
Added functions folder and a 'get ems' function
Added config file to set box-sizing setting and set it to border-box as default
Added box-sizing:content-box mixin
Initial scss files
Merge pull request #4 from sammygriffiths/master

Latest thrust changes