Implementation of Actor State Persistence

[thedrow]

Fixes #25

[ghost]

DeepCode's analysis on #f41566 found:

• :warning: 1 warning, :information_source: 9 minor issues. :point_down:

  Top issues

Description	Example fixes
Use comprehensions instead of list(filter(lambda: x ...)) Occurrences: actors.py:86 actors.py:95	:wrench: Example fixes
Method should have "self" as first argument Occurrences: actors.py:41	:wrench: Example fixes
Access to a protected member _state_machine of a client class Occurrences: resources.py:92 resources.py:107 actors.py:56	:wrench: Example fixes

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[lgtm-com[bot]]

This pull request introduces 1 alert when merging f41566526c62e88b61306a525238b4108e2eb6de into c13b4baf3fb3137888cbb4cd66fe989d0899feed - view on LGTM.com

new alerts:

• 1 for Unused import