Added ability to center cols and spans
Added ability to center cols and spans

Usage: col(12, c)

mojotech/jeet,travisc5/jeet,pramodrhegde/jeet,durvalrafael/jeet,ccurtin/jeet,lucasoneves/jeet,nagyistoce/jeet,jakecleary/jeet,greyhwndz/jeet,rafaelstz/jeet,macressler/jeet,mojotech/jeet