Use vendor mixins and reorder prefixes
Use vendor mixins and reorder prefixes

- Use Bootstrap vendor prefix mixins where available
- Reorder to place not prefixed rule last


Former-commit-id: cc07de9856dbf2c0bced5243678b15826300207c
biplobice/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,triplei/concrete5-8,olsgreen/concrete5,deek87/concrete5,haeflimi/concrete5,biplobice/concrete5,acliss19xx/concrete5,hissy/concrete5,mainio/concrete5,mlocati/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,acliss19xx/concrete5,acliss19xx/concrete5,concrete5/concrete5,haeflimi/concrete5,hissy/concrete5,concrete5/concrete5,hissy/concrete5,jaromirdalecky/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,mainio/concrete5,mainio/concrete5,KorvinSzanto/concrete5,jaromirdalecky/concrete5,a3020/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,biplobice/concrete5,deek87/concrete5,KorvinSzanto/concrete5,MrKarlDilkington/concrete5,mlocati/concrete5,MrKarlDilkington/concrete5,mlocati/concrete5,haeflimi/concrete5,biplobice/concrete5,triplei/concrete5-8,hissy/concrete5,mlocati/concrete5,deek87/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,rikzuiderlicht/concrete5,KorvinSzanto/concrete5,deek87/concrete5,a3020/concrete5,olsgreen/concrete5