Improve badges mixinability
Improve badges mixinability

BS3 commits: 538b3ca06f068237e05ac66fce7f4d60d2b5a98f

todc/todc-bootstrap,ztx1491/todc-bootstrap,mozillo/todc-bootstrap,todc/todc-bootstrap,up2vs/todc-bootstrap,2947721120/googlebt4,aaroncnhk/todc-bootstrap,todc/todc-bootstrap,2947721120/todc-bootstrap