Update the flat button mixin to take additional args
Update the flat button mixin to take additional args

jasonwalkow/bourbon,chriseppstein/bourbon,nagyistoce/sass-bourbon.io,thoughtbot/bourbon,greyhwndz/bourbon,smithdamen/bourbon,nickg33/bourbon,smithdamen/bourbon,greyhwndz/bourbon,mindeavor/bourbon,thoughtbot/bourbon,Nikeshsuwal/bourbon,jamadam/bourbon-docs-jp,setie/bourbon,zyj1022/bourbon,jasonwalkow/bourbon,craftsmen/bourbon,jamadam/bourbon-docs-jp,ismarkunc/bourbon,cllns/bourbon,chriseppstein/bourbon,setie/bourbon,zyj1022/bourbon,craftsmen/bourbon,jamadam/bourbon-docs-jp,san650/bourbon,jamadam/bourbon-docs-jp,Jazz-Man/bourbon,jamesmenera/bourbon-libsass,jamesmenera/bourbon-libsass,Jazz-Man/bourbon,mindeavor/bourbon,nickg33/bourbon