New 0.8.
Add 0.8 features.
PIOTEAM-41 remove apiversion.
PIOTEAM-41. $delete actions
PIOTEAM-41 $delete
PIOTEAM-41, remove tags
PIOTEAM-41 remove creationTime.
PIOTEAM-41 eventtime.
PIOTEAM-41 yahoo stock import example.
PIOTEAM-41 itemrank-quick-start
Add status check in itemrank demo.
PIOTEAM-41 movielens
PIOTEAM-41. Simplify movielens import.
PIOTEAM-41. Fix batch import.
PIOTEAM-41. Change eventTime to event_time.
PIOTEAM-41. Itemrank quick query.
Update API
Finalize sdk interface.
fix event_time micro / milli seconds bug.
update doc for 0.8