fix static navbar container issues, clean up docs presentation by unfixing the top navbar in favor of static one, start adding table of contents for longer sections of docs

remove popoverarrows mixin, relegate code to tooltips and popvers since we only used them once each; this fixes the problem of broken tooltips in 2.1

use variablef or wells background-color, update docs for glyphicons license mention, update popovers to remove that thick border and make them look mo betta

row-fluids don't have the same negative margin-left as rows. This was
throwing everything off.
So added a different rule for first-child and subsequent "spans".