#2119 Add IndexFeatures to CustomKernel and add document.
Fix comments and ERROR information.
Fixed indentation and removed copy function.
Fixed travis bug, EXPECT_NEAR needed.
Add `--break-blocks` to add newlines after blocks
Fixing style issues in SGSparseVector.cpp using astyle.
Another unit test that covers another problem if features are not sorted.
Merge pull request #2139 from tklein23/another_sgsparsevector_unittest

Another unit test that covers another problem if features are not sorted
Fixing control flow error (and a memory leak) found by coverity.  CID 26646
Fix uninitialized variables found by coverity CID 26595
Fixing unused variable found by coverity CID 26592
Uninitialized member in CResultset found by coverity CID 26464
Fixing centering matrix bug - found by coverity CID 25867
Wrong precondition in SGMatrix::compute_eigenvectors found by coverity CID 25834
Memory allocation issue detected by coverity CID 25812
Memory allocation issue detected by coverity CID 25814
Uninitialized members in OnlineLibLinear found by coverity CID 26565
Fixing leak in example libshogun/base_load_file_parameters.cpp
Merge pull request #2140 from tklein23/coverity_error_cid_26646

Fix control flow error (and a memory leak) found by coverity CID 26646
Fixing leak in example libshogun/base_load_all_file_parameters.cpp