Added support for MongoDB aggregation framework to the datasource#74

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codingthoughts wants to merge 2 commits intoichikaway:cake2.2from codingthoughts:cake2.2

+254-21

Commits on Apr 30, 2013

Added support for MongoDB aggregation framework to the datasource
codingthoughts
committed

Commits on May 1, 2013

Added some error checking to data source and added test cases to test aggregation
codingthoughts
committed