nuke commented out docs css
Ditch `&`, as `+ ...` is enought
Merge pull request #11102 from ZDroid/less-fix

Ditch `&`, as `+ ...` is enought
Add Note About Changing to MIT
Merge pull request #11105 from twbs/license-note

Add notes about dual-licensing contributions before switching to MIT in v3.1
update jumbotron docs; fixes #11109
Merge branch 'master' of github.com:twbs/bootstrap