Switch to CMake for libpixyusb build system.

+ Tested with: Mac OS X 10.6.8
fix color code modes
fix pixelsOut error
Switch to CMake for libpixyusb build system.
Updates to CMake list files:

+ Changed libboost requirement from 1.55 to 1.53
+ Fixed order of linking cmake problem with libpixyusb
+ Changed CMake minimum version from 3.0 to 2.8
libpixyusb: CMake: Changed libboost minimum version to 1.49.
Implemented processing of CCB2 chirp message data in libpixyusb.

+ libpixyusb can now read 'normal signature' and 'color code' signature type blocks.
Increased precision of libpixyusb comment in README.md
Set version to: v0.2 development
Make parameter names in function prototypes consistant with comments to reduce ambiguity.
libpixyusb: Ongoing development of pixy_command()
libpixyusb pixy_command ongoing development...

+ Added PixyInterpreter::send_command (varidic).
+ Request pixy version from 'hello_pixy' example using pixy_command().
libpixyusb v0.2 development.

+ Added usage examples for 'pixy_command' in hello_pixy example.
+ Enforce mutual exclusion for Chirp Receiver (receiver_) object.
Bump VERSION to v0.2