fix evaluation_cross_validation_multiclass_mkl example

- streaming features are not needed inside this example. Just use
SGVector/Matrix's load functions
- fix memory leak in SGVec/Matrix's load function
- bump shogun version to 2.2
convert another example to use SGVector/Matrix's i/o ops
Don't use streaming features for simple SGMatrix/SGVector i/o

Instead use their load routines. Require splitted up 7 class data
example (into data and labels) and adjust news accordingly. Drop
unnecessary includes in examples (don't!)
Merge branch 'master' of git://github.com/shogun-toolbox/shogun