#89: Implement revocation command

• create revocation command and related revocation.py file
• write tests for revocation.py
• initiate identity module
• write tests for identity module

Close #89 (closed), #413 (closed), #416 (closed).

changed milestone to %0.10.0

added D: Revocation Feature Web of Trust labels

changed title from #89 (closed) revoke to #89 (closed): Implement revoke command

changed the description

mentioned in issue #385 (closed)

Quick review done. Great work! You made a really good progress!

added 3 commits

• 84b3859e - [enh] #89 (closed) add the ability to revoke an identity
• 820caa7b - [mod][tests] #89 (closed) add a mocked block for currency gtest
• b01f9344 - [tests] #89 (closed) create tests for revoke function

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