Add Support for Credits/Refunds#158

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ansoni wants to merge 8 commits intoTeevity:masterfrom

slgmibu:feature/credit_support

Commits on Feb 26, 2015

first pass for credits
ansoni
committed

Commits on Mar 2, 2015

Commits on Apr 9, 2015

Updates to credit processing to ensure we capture all credit entries properly.
ansoni
committed

Commits on Jul 13, 2015

Commits on Oct 21, 2015

Add code to constrain credits to within a month
ansoni
committed