Merge pull request #2348 from lambday/feature/btest

Fixed overflow error in CLinearTimeMMD and CBTestMMD and added libshogun example for B-test
Added DEPRECATED versions of statistic and variance in streaming MMD

DEPRECATED versions are available with

 - statistic type S_UNBIASED_DEPRECATED
 - null variance estimation method NO_PERMUTATION_DEPRECATED
 - null approximation method MMD1_GAUSSIAN_DEPRECATED