Convert mpl drawer to use _utils.get_instructions() (#1278)
Convert mpl drawer to use _utils.get_instructions() (#1278)

* Convert mpl drawer to use _utils.get_instructions()

This commit converts the matplotlib drawer to use the
_utils.get_instructions() function instead of using the transpiler. This
allows us to remove our dependency on the transpiler for circuit
visualization and also makes our bit ordering consistent with the
documented ordering.

Fixes #1272

* Fix reverse bit order

* Update _get_instructions() call for #1316

* Update _matplotlib.py

QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py