* on v4l screenshot, print out nosignal threshold values
* separate fractional parameters for no signal detection
* fully implement handling for "rainbow grabber"
* Replaced getoptplusplus with QCommandLineParser. Fixes#39
* enabling C++11 if possible
* enabling C++11 if possible
* fixed gcc compilation issues
* fixed linux builds and improved os x build
* trying to fix dispmanx
* trying to fix dispmanx
* simplified travis build script
* fixed argumentparser default values
* rewrote validator system and made sure default arguments are processed correctly
* rewrote validator system and made sure default arguments are processed correctly
* fixed bool vs. regular options
* oops... removing debug code
* reverted screenshot api change
