tools: Add mkcontrib.py

Merge pull request OpenKinect#530 from xlz/release-cleanup

Release cleanup, fix memleaks, packaging helpers.

Merge pull request OpenKinect#507 from xlz/preemptive-api-expansion

Preemptive API expansion

Merge pull request OpenKinect#450 from alberth/cmake_doxygen_config

Add doxygen configuration and target to cmake