Update README.md
Add footer support.
Merge pull request #1 from joemoore/footer

Add footer support.
Splitting out "watch" behavior from "build" behavior.

Because a rake task should never create an orphaned daemon,
particularly the default rake task.
Update styles.

Render `H1` and `strong` the same.
Render `H2` and `em` the same.

This is so you can control the look of the presentation, but still maintain a semantic outline.
Add switch to make all ULs hidden notes.
Default rake task should open too.
Update deck w/ newest presentation tool.