MichaelBroughton

Right now our sampler code for custom `cirq.Sampler` instances is not as clean as it could be. At some point we should make a more deliberate effort to clean this...

Support for Projectors in Expectation Calculations

2

Right now Cirq does not allow such things as: ```python3 a = cirq.Z(q0) * cirq.Z(q0) + projector(0111011001) a.expectation_from_wavefunction(a, ...) ``` One must manually write out the projection operators like: ```python3...