Initial commit
Started Alex's branch for messing around
Spring cleaning.
Added some Tool classes, can now drag / create triangles + circles
Added comments to tools.py
Added box creation tool
Added the grab tool
Added joint tool
Added menu bar at top
cleaned up menu
Added polygon and magic pen tools
Drawing description
Merge branch 'Alex' of git://dev.laptop.org/activities/physics

Epic merge

Conflicts:

	physics.py
mv physics.py activities.py
Now should run as an an activity no problem
Added the destroy tool
Modified the joint tool to allow for fixed joints
Modified joint tool to use left click to add a centered fixed joint
Destroy tool now allows for drag+destroy
Changed the screen size to be dynamic
Added a red trail to the destroy tool