adding setter methods and QuerySelector instance variable
removing parsing logic from QuerySelector and adding AttributeProcessorList
adding getEventCount()
Merge branch 'master' of https://github.com/sacjaya/siddhi-3

Conflicts:
	modules/siddhi-core-new/src/main/java/org/wso2/siddhi/core/query/selector/QuerySelector.java
Merge remote-tracking branch 'origin/master'