With Bootstrap, we don't need HTML5 boilerplate CSS

The Bootstrap CSS will do all the resetting needed.
We don't need or use Modernizr right now

I don't plan on using too many fancy features that need feature
detection.
Remove no-js class

This was a left-over from the use of Modernizr (which would replace it
with a "js" class when it detected that the browser supported
JavaScript). We absolutely need JavaScript so the tag is redundant.
Remove IE6 and IE7 specific markup

This was there to add special classes for these browsers. However, the
browsers are practically dead: outside of China, IE6 is used by less
than 1% of the users and IE7 is universally used by less than 1%. See:

  http://theie6countdown.com/
  http://theie7countdown.com/

for details.
Remove IE8 specific markup

I don't plan on doing anything special for IE8 that would require
selecting that browser specifically. The usage of IE8 is about 10%
worldwide, so we should probably still test the site with it:

  http://theie8countdown.com/
Merge pull request #3 from mgeisler/remove-legacy-ie-support

Remove legacy IE support