[WIP] Credit draft implementation.#144

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pgev wants to merge 2 commits intoOpenST:developfrom

pgev:credit-develop

Commits on Jan 24, 2019

Credit draft implementation.
Paruyr Gevorgyan
committed

Commits on Feb 4, 2019

If there is no credit, CreditRule simply directs executeTransfers calls to TokenRules.
Paruyr Gevorgyan
committed