add support for setting approvers on Bill or VendorCredit#3

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superpan wants to merge 5 commits intoaltmind:masterfrom

Commits on Jan 5, 2016

Merge pull request #1 from wrapify/approvalsupport
superpan
committed

Commits on Jan 6, 2016

Merge pull request #2 from wrapify/approvalsupport
superpan
committed

Commits on Jan 22, 2016