add David (david-dm.org) badge to monitor currentness of dependencies
add cross-reference to .navbar-left/right in .pull-left/right docs
update outdated JSFiddle example
Merge pull request #10040 from twbs/pull-navbar-docs

add cross-reference to .navbar-left/right in .pull-left/right docs
Merge pull request #10012 from twbs/david-badge

add David (david-dm.org) badge to monitor currentness of dependencies
Merge branch 'master' of https://github.com/twbs/bootstrap into 3.0.0-PES