Remove server and client related code
Add new interface class `multiclass_classifier`

I added new interface named multiclass_classifier,
renamed classifier_base to linear_classifier.
Divide driver files to jubatus_driver module
Fix pass to test
Fix include guard
Move factory to driver
Remove mixable_holder from core
Add msgpack save/load
Add graph/stat msgpack based save/load

Remove unused member form anomaly_base.
Make recommender and lof_storage serializable