Also changed README wording slightly.

Now you can add links to the bottom of your table of contents!
Documentation has also been changed to reflect this new
feature.

Please note that if you have a custom variables.scss, you'll have
to merge in this line:

    $nav-footer-border-color: #666;

* Reworded a bunch of sections
* Added "features" section with bullets for the various features
  of Slate
* Added screenshot of Slate

Seriously upgraded the README documentation.
ALso, added a tiny fix to the Kittn example in index.md.

Changed a tiny wording thing.

Fixed some more formatting problems, and reworded a few sections.

Fixed another problem where the table example would show up as an actual table instead of a markdown example.

Fixed a tiny problem

Added some more helpful information.

Just made some edits, added the Slate name, and fixed the code rendering issue.

Now, if no languages are specified, the language selection bar simply doesn't appear.

It has also been renamed from "languages" to "language_tabs".

Additionally, now language names default to the markdown name. They can still be overridden by the languagename:Display Name syntax.

Add automatic hash generation with redcarpet dev, and change tocify scrollHistory to be compatible with the ids