Fix margin for custom $button-border-width
Fix margin for custom $button-border-width

The margin was fixed to "-1px", so if $button-border-width variable was set to custom border-width, it resulted in a disproportionately buttons-group.
natewiebe13/foundation-sites,jxnblk/foundation,lizzwestman/foundation,claytonrodgers/foundation,carey/foundation,glizer/foundation,labr1005/foundation,robottomw/foundation,a-dg/foundation,pauleds/foundation,zurb/foundation-sites-6,themccallister/foundation,ysalmin/foundation,Teino1978-Corp/Teino1978-Corp-foundation,a-dg/foundation,Klaudit/foundation,NikhilKalige/foundation,Iamronan/foundation,atmmarketing/foundation-sites,djlotus/foundation,marcosvicente/foundation,joe-watkins/foundation,r14r-work/fork_foundation_master,oller/foundation,dragthor/foundation-sites,r14r-work/fork_foundation_master,robottomw/foundation,labr1005/foundation,laantorchaweb/foundation,jxnblk/foundation,Larzans/foundation,iwikmu/foundation,youprofit/foundation,leo-guinan/foundation,stanwmusic/foundation,pauleds/foundation,dimamedia/foundation-6-sites-simple-scss-and-js,Larzans/foundation,mbarlock/foundation,laantorchaweb/foundation,aoimedia/foundation,ioanok/foundation,designerno1/foundation-sites,signal/foundation,elkingtonmcb/foundation,zurb/foundation-sites-6,Klaudit/foundation,rxfork/foundation,oller/foundation,Klaudit/foundation,iwikmu/foundation,glunco/foundation,natewiebe13/foundation-sites,jaylensoeur/foundation-sites-6,sitexa/foundation,wikieswan/foundation,NeonWilderness/foundation,jlegendary/foundation,Teino1978-Corp/Teino1978-Corp-foundation,glizer/foundation,NeonWilderness/foundation,joe-watkins/foundation,signal/foundation,claytonrodgers/foundation,BerndtGroup/TBG-foundation-sites,NeonWilderness/foundation,aoimedia/foundation,stanwmusic/foundation,adstyles/foundation,signal/foundation,samuelmc/foundation-sites,abdullahsalem/foundation-sites,djlotus/foundation,ysalmin/foundation,NeonWilderness/foundation,ysalmin/foundation,celsoyh/foundation,denisahac/foundation-sites,DouglasAllen/css-foundation,sitexa/foundation,lizzwestman/foundation,youprofit/foundation,pwnall/foundation-sites,celsoyh/foundation,getoutfitted/reaction-foundation-theme,glunco/foundation,walbo/foundation,asommer70/foundation,joe-watkins/foundation,MarcGuay/foundation,colin-marshall/foundation-sites,adstyles/foundation,birthdayalex/foundation,yohio/foundation-sites-6,sethkane/foundation-sites,ibroadfo/foundation,sitexa/foundation,ibroadfo/foundation,socketz/foundation-multilevel-offcanvas,DouglasAllen/css-foundation,designerno1/foundation-sites,zurb/foundation,r14r/fork_foundation_master,Klaudit/foundation,youprofit/foundation,ioanok/foundation,IamManchanda/foundation-sites,JihemC/Foundation-Demo,andycochran/foundation-sites,leo-guinan/foundation,vrkansagara/foundation,getoutfitted/reaction-foundation-theme,vita10gy/foundation,asommer70/foundation,glizer/foundation,DouglasAllen/css-foundation,pauleds/foundation,laantorchaweb/foundation,zurb/foundation-sites,zurb/foundation-sites,zurb/foundation-sites,elkingtonmcb/foundation,0111001101111010/foundation,labr1005/foundation,IamManchanda/foundation-sites,573/foundation,atmmarketing/foundation-sites,stanwmusic/foundation,celsoyh/foundation,anbestephen/foundation,djlotus/foundation,walbo/foundation,karland/foundation-sites,BerndtGroup/TBG-foundation-sites,aoimedia/foundation,marcosvicente/foundation,labr1005/foundation,573/foundation,robottomw/foundation,Iamronan/foundation,marcosvicente/foundation,designerno1/foundation-sites,mbencharrada/foundation,barnyp/foundation,jamesstoneco/foundation-sites,mbarlock/foundation,pdeffendol/foundation,robottomw/foundation,zurb/foundation,Iamronan/foundation,RichardLee1978/foundation,Mango-information-systems/foundation,glizer/foundation,colin-marshall/foundation-sites,samuelmc/foundation-sites,pdeffendol/foundation,brettsmason/foundation-sites,PassKitInc/foundation-sites,jaylensoeur/foundation-sites-6,pdeffendol/foundation,glunco/foundation,Owlbertz/foundation,birthdayalex/foundation,karland/foundation-sites,JihemC/Foundation-Demo,jamesstoneco/foundation-sites,r14r-work/fork_foundation_master,abdullahsalem/foundation-sites,anbestephen/foundation,sethkane/foundation-sites,elkingtonmcb/foundation,Ilyes512/foundation,hummingbird-me/foundation-sites-6,advisorwebsites/foundation-sites-6,JihemC/Foundation-Demo,natewiebe13/foundation-sites,gnepal7/foundation,anbestephen/foundation,Owlbertz/foundation,pauleds/foundation,socketz/foundation-multilevel-offcanvas,vita10gy/foundation,jeromelebleu/foundation-sites,getoutfitted/reaction-foundation-theme,gnepal7/foundation,MarcGuay/foundation,mbencharrada/foundation,RichardLee1978/foundation,DouglasAllen/css-foundation,walbo/foundation,pwnall/foundation-sites,jeromelebleu/foundation-sites,dragthor/foundation-sites,mbencharrada/foundation,andycochran/foundation-sites,asommer70/foundation,hboers/foundation,vrkansagara/foundation,jlegendary/foundation,zurb/foundation,marcosvicente/foundation,iwikmu/foundation,mbencharrada/foundation,jxnblk/foundation,a-dg/foundation,mbarlock/foundation,colin-marshall/foundation-sites,wikieswan/foundation,barnyp/foundation,leo-guinan/foundation,DaSchTour/foundation-sites,lizzwestman/foundation,jlegendary/found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