fixed the issues in sort classes and added new classes for site-ops
 added resources for test
added the test of multiwindowdimensionaggregation
changed alertFrequency to alertInterval
Merge branch 'master' of https://github.com/DataTorrent/Malhar
used mutableInt to adding the values in map
integrated the MultiWindowDimensionAggregation with DimensionTimeBucketSumOperator output
adding comments
Merge branch 'master' of github.com:DataTorrent/Malhar