Rename LServing to Serving
Hiding IdentityPreparator. Replace with PPreparator and LPreparator instead.
Add doc group to WithQuerySerializer trait
Merge branch 'develop' of https://github.com/PredictionIO/PredictionIO into develop
Consistent naming [P|L]\w+[DataSource|Preparator|Algorithm|Serving]
Consistent naming [P|L]\w+[DataSource|Preparator|Algorithm|Serving]
Merge branch 'develop' of https://github.com/PredictionIO/PredictionIO into develop