Removing all old docs from /docs and added index.

All the old docs are being removed and replaced with /docs/nupic and
/docs/nupic.core. /docs/index.html contains a simple directory.
Merge pull request #11 from rhyolight/doc-cleanup

Removing all old docs from /docs and added index.
fixed markdown rendering issue on nupic.html.
Merge pull request #12 from rhyolight/nupic-header-markdown-fix

fixed markdown rendering issue on nupic.html.
Added contributor
NuPIC Doxygen automated doc build.
Restructuring last year's hackathon files...

to make room for more hackathon stuff for this year.
Updating hackathon details and schedule.
Merge pull request #15 from rhyolight/spring-2014-hackathon

Spring 2014 hackathon