EAGLESIX-2651: initial port of AddToSet Accumulator from v2.6.5
EAGLESIX-2651: add missing call to reset() in AddToSet
EAGLESIX-2651: fix up test cases for new code
Merge branch 'feature/mongo_2.6.5_accumulators' into feature/mongo_2.6.5_accumulators_AddToSet
EAGLESIX-2651: AddToSet: improve tests; add merge test
EAGLESIX-2651: AddToSetAccumulator: switch tests to use process like other accumulator tests
EAGLESIX-2651: AddToSet: minor fix to ctor test
EAGLESIX-2651: AddToSet: del test names if ours
EAGLESIX-2651: AddToSet: tabs beats spaces
Merge pull request #15 from RiveraGroup/feature/mongo_2.6.5_accumulators_AddToSet

Feature/mongo 2.6.5 accumulators AddToSet