Add cara face tracker

##Changelog 29/7/14
1. added head rotation based on cara face tracker by IMRSV
2. reduced rotation jitters using smoothing and angular velocity of rotational rates
3. added blink, smile, negative, surprise emotion to blendshapes 
4. tweaked Application class to use cara face tracker instead of faceshift by default
coding standard: braces for control structure... repeated throughout this commit