fix #179 IE8: Playground fails to load
fix #178 Playground doesnt work offline
fix #180 IE8: HTML test runner fails to load
closes #201 by integrating code review comment
fix apiref CSS: overflowing text

In Firefox, when zoomed, some text overflows inside a floated container
and is clipped (this also happens in Firefox when the font of code is
changed).

This commit removes the floating, since for a single child element it doesn't
make sense anyway to be floated.

Close #199
playground categories and doc update

close #206
chore: print out sauce connect logs only after failrue

Closes #208