added a section about scrolling and rotating data in memory.
removed :data and :const to simplify the Octo language. Since this is a (minor) breaking change I updated all example code and documentation. While I was at it I made some other improvements to the examples and documentation based on my new experience using Octo.
Merge branch 'gh-pages' of https://github.com/JohnEarnest/Octo into gh-pages
fixed tank.8o to reflect the changes as well.