Merge pull request #210 from danshultz/variable-name-consistency

ensure variables are all camel case - little OCD
Merge pull request #209 from danshultz/global-cleanup

Fix global variable leaks and references.
Merge pull request #211 from danshultz/parseInt-radix

add radix parameter to parseInt
Support a variance for basic onTap detection

Some devices are not tolerant of fat finger touches and will issue a move event in between a down/start and up/end event. This causes "onTap" to not perform well in some scenarios.

Supporting a tolerance for what constitutes as a "tap" provides the a fill gap for devices that issue erroneous events. This was mostly observed on the surface tablet and some instances of windows 8 touch devices.

The threshold can be adjusted by changing ```Gala.TAP_MAX_CONTACT_DISTNACE```.