Revert "Remove corporate mascot due to trademark issues."

This reverts commit cb2f0518efbe95cd2147205a6f71cec8a1050287.
Add description for O section based loosely on original blog post

http://drtortoise.github.io/blog/2012/10/30/c-is-for-computing/
O is for Octocat => O is for Open Source
Merge pull request #1 from cameronmcefee/master

Revert removal of Octocat and write a description that might make everyone happy *yay the octocats are back*