added comment about parallelisation
fixed a nasty bug that would avoid computing type I errors. Very subtle. Subsets were not updated properly
added a unit test that checks whether bootstrapping statistics are the same for a custom kernel and a normal one
added a unit test for the custom kernel in order to check subset settings
added a comment on the previous bug that explains why one has to add/remove the indices every time
Merge pull request #897 from karlnapf/master

More unit tests and bugfixes for MMD kernel selection
illustrate use of precomputed kernel and some minor changes
more illustrative example that is similar to the libshogun one
Merge pull request #898 from karlnapf/master

more illustrative example for quadratic time MMD
fix a memory error
Merge pull request #899 from karlnapf/master

minor memory error in example
moved copy subset example of string features into a unit test
added a nicer error message
fixed a memory leak by using SGVector instead of array
-removed print_kernel_matrix
-added some error messages
-FIXED A BUG WHICH CAUSED SUBSET INDEX CONFUSION (nasty one)
new unit test for subset copying behaviour (fixed bug and this is a test for it)
replaced asserts by expect equal
added example/test for a SVM on string data with a string kernel and a precomputed kernel matrix which are asserted to return the same predictions
added some comments on the MMD examples and the custom kernel bugfix
Merge branch 'mmd_kernel_selection'