Added Graph::weightToBeginAndEnd
In GMM added Eigen's eigen values and vectors
Added interface with ProgressiveCut
Many writed in progressiveCut.cpp and progressiveCut.h

In progressiveCut.h added precompiler option GMM_K - numbers of
gaussians in GMM

In both:
*Added debugging
*Implemented ProgressiveCut::initColorTables(). Initialization of
    QVector<QRgb> maskColorTable;
    QVector<QRgb> strokeColorTable;
    QVector<QRgb> componentsColorTable;
*Implemented and checked ProgressiveCut::createStrokeMask() -
inification of backgroundMask and foregroundMask
*Implemented debugging via ProgressiveCut::setImageOutput(QLabel
*imageView) - QLabel of MainWindow
*Some independed code of GMM written in ProgressiveCut::createGraph()