Updated box-shadow to be compatible with sass v3.1.0+
Updated box-shadow to be compatible with sass v3.1.0+

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