#95, #172: BBC: Arguments changes on 'Documents' constructors: Remove 'signature', introduce 'signing_key', make 'currency' and 'version' optionals

Break backward compatibilities!

• Remove useless signature argument from Documents.__init__()
  • Rename Identity(ts: BlockUID) by Identity(timestamp: BlockUID)
• Refactor Document.signatures (List) as Document.signature (str)
  • Transaction can have multiple signatures, with Transaction.signatures attribute and Transaction.multi_sign([keys]) method.
  • Move signatures verifications in the Documents classes
• Add optional signing_key argument in Document sub-classes
• Refactor subclass version argument as optional with default=subclass.VERSION
• Set time argument optional in SimpleTransaction
• Refactor Documents currency arguments as optional with default=constants.CURRENCY_CODENAME_G1

Close #95 (closed), #172 (closed).

changed milestone to %1.0.0

added D: Block D: Certification D: Identity D: Membership D: Revocation D: Transfer enhancement labels

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• 2a97bcb1 - [enh] #95 (closed) remove useless signature argument from Document.__init__

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• 50c08b25 - [enh] #95 (closed) remove useless signature argument from Document.__init__
• 9e691bb5 - [enh] #95 (closed) add Identity.from_lookup_response() to simplify examples

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• 44049e44 - [enh] #95 (closed) refactor Document.signatures (List) as Document.signature (str)...

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• 51707499 - 1 commit from branch dev
• ce59413b - [enh] #95 (closed) remove useless signature argument from Document.__init__
• 2fd92deb - [enh] #95 (closed) add Identity.from_lookup_response() to simplify examples
• 6efade74 - [enh] #95 (closed) refactor Document.signatures (List) as Document.signature (str)...

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• b4195ffa - 1 commit from branch dev
• ff8a9c47 - [enh] #95 (closed) remove useless signature argument from Document.__init__
• 64e46aa9 - [enh] #95 (closed) add Identity.from_lookup_response() to simplify examples
• f8c5fe14 - [enh] #95 (closed) refactor Document.signatures (List) as Document.signature (str)...

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• 0228d596 - [enh] #95 (closed) add Identity.from_lookup_response() to simplify examples
• 786618db - [enh] #95 (closed) refactor Document.signatures (List) as Document.signature (str)...
• e57ddfb6 - WIP [fix] #95 (closed) Fix check_signatures(pubkeys) in Transaction class

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• 3a49eca8 - [enh] #95 (closed) refactor Document.signatures (List) as Document.signature (str)...

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