* Update ie10-viewport-bug-workaround.js year
* Update narrow-jumbotron copyright year to 2017
* Update carousel/index.html copyright year to 2017
* Update browsers-devices.md copyright year to 2017
* Update change-version.js copyright year to 2017
* Remove IE compatibility mode meta tag from docs, examples, and JS tests as we no longer support IE9 and IE8
* update and remove some IE bits from our supported browser page
* update introduction.md to match
* reword starter template intro
- <progress> element didn't allow animation, labels overlaid, multiple bars, etc.
- Revamps CSS to use something more similar to v3's implementation
- Ditches variant mixin for `bg-` utils
- Rebuilds docs to match, including adding a new Height section for customizing that.
Only potential remaining todo is adding `.sr-only` instances to within the bar. Unsure if that's necessary.
- since we're column to start, need to set row.
- note that flex-direction cannot be inherited, so we have to set it twice.
- apply the horizontal padding again to .nav-link.
- remove the .nav-item styles (un-needed).
- remove previous .nav-link styles as they were un-nested and potentially problematic in old placement should someone mix more navs in here.
since we're no longer using the .nav as a base class, we need to bring over some base styles for redoing browser list styles and setting flex in motion.
also brings with it some .nav-link styling. we're still using this global class, but with this small modification for alignment of content in responsive modes.
