feat(lird.py): Fine grained selection of SVM kernels

Before all kernels have been trained all the time, now one or more kernels can
be selected.
fix(lird.py): Sigmoid Kernel SVC, SHIT ==> OKAY

The gamma parameter of the Sigmoid Kernel was chosen very badly. Therefore the
classification failed. Now the parameter has been precomputed and sigmoid
classifier is now performing much better.