adding comments
length window processor implementations
methods to support window implementation
method refactor
window query parser implementation
test cases for window implementation
removing validator exception
Merge branch 'Siddhi-3.0.0' of https://github.com/sacjaya/siddhi into Siddhi-3.0.0
add stream definition validation
merging scjaya/Siddhi-3.0.0
code formatting
making ValidateExecutionPlan() public
renaming varaibels of MetaStreamEvent
adding extension loader