Merge pull request #879 from karlnapf/master

unit tests for kernel selection
More safety for parameter dictionary routine. Related to #880
Enabled GCOV when profile is enabled
Added a unittest for MDS
Added multiclass liblinear test
Guarded mds test
Fixed wrong spectrum mismatch rbf construction in static interfaces
don't use ref'counted matrix in parameter example (fixing double free!)
minor fixes to compile VW examples
* minor warning fixes

Mainly in statistics module doc
Merge pull request #884 from iglesias/fix-warning

* minor warning fixes
Fixed typo in MKL
Merge pull request #883 from iglesias/dev

minor fixes to compile VW examples
Speeded up MDS unit test
add unit test for sgvector's setters/getters
refactor parameters to use SGVector as dims (for future ndarray support)
include SGMatrixList.h instead of .cpp (Closes: #855)

Thanks bianjiang for the fix!
Mention of include fix in NEWS. Related to #855
Merge pull request #887 from karlnapf/master

added a new create_merged_features method
Merge pull request #888 from karlnapf/master

better handling of null distribution sampling for linear time mmd