Merge pull request #6 from DarcyMyers/master

virtualenv slides and (free & legal) pdf Python books for kids
merge commit
Add CH10
Added some iPython notebooks for Project Euler problems 10 to 13, tiny changes to iPython notebooks for 4 others.
Renamed iPython notebooks for Chapter 4 to follow naming scheme
Renamed files from Chapter_5 sub-directory
Added Ch 1 Part 1-3
Update README.rst

Added Dorothy Sanchez's repository link as per her request.
Created a comments/links/sharing section of the readme so people who want to be active on GitHub can easily share with each other.
Feel free to change if this seems confusing.