Make gitignore consistent with Bootstrap's
Revamp docs JS

* Move JS to the footer
* Dedupe the JS needed for the Twitter tweet and follow buttons
replacing the slider images with small jpgs
fix the slider example on mobile.
removing old device images
Merge pull request #361 from twbs/device-sprite

Use a sprite for device images
Merge pull request #360 from twbs/slider-images

Reduce the file size on slider images
Merge pull request #357 from twbs/updated_gitignore

Make gitignore consistent with Bootstrap's
Merge pull request #356 from twbs/docs_js

Revamp docs JS
don't track .sass-cache
changing push to navigate
somehow missed the template
typo
adding back in the deprecated classes
update android
clean up
fix a typo in docs
Merge pull request #363 from twbs/typo

Fix a typo in docs
derp anther typo
Merge pull request #364 from twbs/another-typo

Another docs typo