add stubby OS & browser compatibility table to docs
grunt dist
Merge pull request #698 from twbs/compat-docs

add stubby OS & browser compatibility table to docs
Correct tree symbols.
Merge pull request #702 from vsn4ik/whats_included_tree_symbols

Correct tree symbols.
Switch to "grunt-sass".
Add "grunt-banner".

We can't add a banner with "grunt-sass".
Run `grunt`.