More class name cleanup

-Made tabs modifications more modular.

-Added a single-line tab style.

-Fixed grid gutter issue.

-Added some new boxes.

-Fixed some spacing issues with tabs.

-Made responsive alignments.

-Added more spacing options.

-Modular scale uses pow instead of exponent for more precise scaling
(along with the ability to use floats.)

- hr tags now more modular and not dependent on magic numbers.

-Added .p class for more modular styling of "normal" text.

- Fixed some JSLint warnings.