Feature/vputz optional dependencies#3

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feature/vputz-optional-dependencies

Commits on Jul 29, 2020

Added comparison/benchmark notebook with pauli expectation values
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Commits on Aug 26, 2020

Initial optional import for Qusetta
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Commits on Sep 1, 2020

Merge pull request #5 from qcware/qiskit-qiskitaer
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