remove predicate level and associated functionality
Merge branch 'Siddhi-3.0.0' of https://github.com/wso2-dev/siddhi into Siddhi-3.0.0
Merge pull request #27 from sacjaya/Siddhi-3.0.0

Improved extension loader
Merge pull request #28 from sacjaya/Siddhi-3.0.0

Siddhi 3.0.0
adding SiddhiWindow interface draft implementation
Merge pull request #29 from tishan89/Siddhi-3.0.0

Siddhi 3.0.0