OIP-draft credit.#9

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pgev wants to merge 5 commits intoOpenST:masterfrom

pgev:oip-credit-draft

Commits on Dec 7, 2018

OIP-draft credit (airdrop).
Paruyr Gevorgyan
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Commits on Dec 10, 2018

Improve Summary, Abstract & Specification sections.
Paruyr Gevorgyan
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Improve header section.
Paruyr Gevorgyan
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Commits on Dec 11, 2018

CreditBudgetHolder is organized (only) and does not inherit from MultiSigWallet.
Paruyr Gevorgyan
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Improve class and sequence diagrams.
Paruyr Gevorgyan
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