Adding Colors notebook and ipythonblocks.py file.
Interim commit of 'Playing with Blocks' section.
Fleshed out 'Playing with Blocks' section.
Added some additional stuff to the Playing with Blocks section.
Starting work on the Building Blocks segment.
Need to start over on the Building Blocks section.
Put together what seems like a reasonable Building Blocks section.

Covers reading files and introduces lists and strings. Now to actually
make those animation frames...
Adding animation frames and notebook used to create them.
Moved the section learning goals into their respective sections.
Added functions and glob to Building Blocks section.
Renamed README to instructor_notes and added new general README.
Removing a lot of stuff we're not using at UW.
Merge branch 'ipythonblocks' into 2013-02-25-uwash-B