Line up batteries inside battery pack (slightly cheating)
Merge pull request #66 from snhack/battery_vitamins

Line up batteries inside battery pack (slightly cheating)
Diagnosing build error
Added a Snap Pin utility.
Modified pins.scad to make default diameter == PinDiameter
Start of some bumpers
Add some push rods
MicroSwitchHolder and some layout
Temporairly hack into main model
Better microswitch holders giving more ground clearance
Remove rogue echo statement.
Added springy bits

for illustration purposes only :)
Bumper with spingy mounts