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.
Merge pull request #10 from vsaw/8-svm-sigmoid

8 svm sigmoid