Merge pull request #126 from scottpurdy/gh-pages

Updates to OSCON preso
Added notes to slides to define who the main speaker is. Made the code a little bigger in some places.
newline :(
Merge pull request #127 from rhyolight/gh-pages

Added some slide notes, cleaned up a few things.
Added slide for hackathons. updated table styles.
Add more SDR slides to show the cool properties of them.
Adding back the handle/engine analogy for the 'why nupic is different' section.
Add hotgym images.
Initial step in response to Jeff's feedback (WIP).
Adds FAQ section about adding external libraries.