Rename HMSVMLabels to SequenceLabels.
Because these labels can be used in other StructuredModels apart
from the HMSVMModel.
fixed memory leak in Statistics.log_det_test_3 unit-test
fixed memory leak in Statistics.log_det_test_3 unit-test
Fix segfaults in libshogun GP examples
Experiment to built all branches with travis.