Merge pull request #35 from sacjaya/Siddhi-3.0.0

Siddhi 3.0.0
Removing EventManager and adding EventConverter and EventPool to EventChunk
Improving EventChunk methods
Improving EventChunk and StreamEventPool usage
fixing LengthBatchWindow
moving stream runtime to query input
Adding CURRENT, EXPIRED, TIMER, RESET types to StreamEvent
adding time window and time window test case
Adding join support and join test case