[WIP] Credit#198

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pgev wants to merge 7 commits intoOpenST:developfrom

Commits on Apr 10, 2019

Credit draft implementation.
Paruyr Gevorgyan
committed
If there is no credit, CreditRule simply directs executeTransfers calls to TokenRules.
Paruyr Gevorgyan
committed
Fix conflicts after rebasing on top of develop.
Paruyr Gevorgyan
committed

Commits on Apr 11, 2019

Fixed failing testcases after rebase.
Paruyr Gevorgyan
committed

Commits on Apr 12, 2019

Fixed failing unit tests and linter issues.
Paruyr Gevorgyan
committed

Commits on Apr 17, 2019

Introduced TransfersAgent interface. Removed CreditInfo struct from CreditRule.
Paruyr Gevorgyan
committed

Commits on Apr 18, 2019

Remove re-entracy issue reported by slither.
Paruyr Gevorgyan
committed