Joshua Harlow 336caf6ddb Add engine state diagram ...

Add a nice visual representation of the states the action
engine yields back while executing (which are available from
its run_iter method) and give a brief overview of what these
states mean and how they are used (in diagram and in text).

Change-Id: Idc6abc83e0ed7510c0e4c58b7fcfc26cce3e98a2

2014-07-28 23:11:20 +08:00

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Add engine state diagram

2014-07-28 23:11:20 +08:00