README.md: switch to SVG badges.
fix part of #561
Animated transition on `window.history.back()`
Merge pull request #557 from artemave/patch-1

Animated transition on `window.history.back()`
Let me close tabs please. Let me zoom please.
Merge pull request #577 from twbs/happier-users

Let me close tabs please. Let me zoom please.
Update dependencies.
Run `grunt dist`.
Update .travis.yml
Remove the unused `grunt-contrib-nodeunit` module and update the rest.
Revert f452db1bb09a71b9782edeb4a21c75ae049ede74.

The validator doesn't choke anymore on this and even though it's not spec compliant, it's needed for some IE versions. So until we move favicon.ico in root, this should do the job.
Clean up validator suppressions.
Add Autoprefixer support.
Refactor Gruntfile.js targets.
Run `grunt`.