remove duplicate maven plugins. Added travis config
Merge pull request #7 from rmetzger/master

remove duplicate maven plugins. Added travis config
StreamComponentHelper refactor to Generics
StreamComponentFactory rename to StreamComponentHelper
FaultTolerancy update with timekeeping + concurrent publishing bugfix
merge
Implemented thread safe event publishing
initiate window
Merge branch 'window' of https://github.com/Frank-Wu/stratosphere-streaming into window