Added policy flag to enable leap control in the background
Updating code to work with latest Leap SDK 1.0.8.7665 (windows). Mostly changing .empty to .is_empty. FingerControl still doesnt work due to major changes in Leap SDK - see https://github.com/openleap/PyLeapMouse/issues/14#issuecomment-23197811
Merge pull request #21 from skylogic004/master

Updating to latest Leap SDK, and added background policy flag. Thanks to skylogic004