fix up justified nav example
fix Examples link on docs homepages; fixes #9693
fix up sticky footer example (fixes #9680) and add favicons to all examples
Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
xs button is xs-er (fixes #9695)
fixes #9697
fixes #9642: open dropdown nav items get proper styling
fixed navbar static top borders
Fixed up examples more

* sticky footer side scrolling
* static and fixed navbar more similar
* min-height on static and fixed navbar examples to illustrate
differences

last two items fix #9702
switch to margin on navbar-nav to avoid stacking negative space reported in #9705
docs cleanup on naming to fix #9710
finish up second pass through docs nav, headings, organization, naming, etc (another run through at #9710)
basic cleanup on carousel example (fixes #9709 and #9700)
Justified nav now responsive; example updated accordingly (fixes #9708)
increase spacing on homepage links and social buttons (fixes #9706)
fixes #9701: fix up offcanvas example
carousel example: add dummy 'src' attributes to <img>s
carousel example: add alt text to images
Merge pull request #9717 from twbs/carousel-html-compliance

Fix carousel example to pass HTML5 validator
fixes #9475