…Link into feat/context/time

  - removed region/endregion annotations

  - removed region/endregion annotations

• Projection
  - _execute now calls super()

• States
  - all subclasses now call super()_execute rather than function directly
    (so that increment_execution_count and current_execution_time
     can be called on Component)

• Log
  _get_time: now gets system directly from ref_mech.context.composition

  - renamed _params_dict to attributes_dict

  - current_execution_time: implemented
  - _update_current_execution_time(): implemented

• Mechanism
  attributes_dict:  added EXECUTION_TIME

…PrincetonUniversity/PsyNeuLink into feat/context/time

  - docstring revs to user_params,
    and added execution_count and current_execution_time

  - docstring revs to user_params,
    and added execution_count and current_execution_time

• Mechanism
  - docstring revs added attribute_dict

…PrincetonUniversity/PsyNeuLink into feat/context/time