refactoring to make rgb and ir packet stream parsers and packet processors configurable, this will allow to easily swap different implementations and even use different implementations per device
fixed license header
replaced default argument with method overload
renamed PacketProcessorFactory to PacketPipeline, moved all ownership handling of packet parser and packet processor objects to PacketPipeline
Merge branch 'master' into configurable_pipeline

Conflicts:
	examples/protonect/src/libfreenect2.cpp
Merge branch 'master' into configurable_pipeline

Conflicts:
	examples/protonect/include/libfreenect2/libfreenect2.hpp
	examples/protonect/src/libfreenect2.cpp
Merge pull request #38 from christiankerl/configurable_pipeline

make packet processing pipeline configurable