Add debug configuration mode

If autowiring_DEBUG is set when find_package(autowiring) is called, extra debug information will be printed
Use debug mode when building examples
Add STATUS configuration to debug messages
Merge pull request #202 from leapmotion/feature-autowiring_DEBUG

Feature autowiring debug
Adding capability to build on Arm-Linux

Instructions have been added to inform users of how to build Autowiring for Arm-Linux targets.  The only requirement, outside of the toolchain installation proper, is a local installation of "boost," otherwise autonet cannot be built.

Libraries built to target arm will have "Arm" as a suffix to differentiate them from other target architectures.

Currently we cannot build Autonet on ARM because of our use of boost libraries and the status of Autonet as a shared library; this will have to be fixed later when we can compile the library as position-independent code.