#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.
Fixing style issues in SGSparseVector.cpp using astyle.
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
Fixing leak in example libshogun/base_load_all_file_parameters.cpp
Replace CALLOC my MALLOC

For @karlnapf.
Fix memory problem from coverity CID 26288
Missing break statement found with coverity CID 26157
Uninitialized Gmax_init (dead code) found by coverity CID 25869
Merge pull request #2154 from yorkerlin/develop

add the variaitonal example program with document
Merge pull request #2145 from tklein23/coverity_error_cid_25834

Wrong precondition in SGMatrix::compute_eigenvectors found by coverity CID 25834
Merge pull request #2147 from tklein23/coverity_error_cid_25814

Memory allocation issue detected by coverity CID 25814