Enabled/fixed streaming_onlineliblinear example

In streaming_onlineliblinear example:
* Fixed streaming header includes (have been moved to streaming subfolders).
* Fixed dynamic_cast from CStreamingDenseFeatures<float64_t> to CStreamingDenseFeatures<float32_t>.
* Fixed memory leak
* Added streaming_onlineliblinear to target list in examples Makefile

In OnlineLinearMachine:
* Fixed small memory leak (did not free DynArray).