Circuits from service should track the global phase

[nonhermitian]

The issue that raised #11 is due to the fact that it seems the transpiler service is not keeping track of the global phase and/or attaching that phase to the output circuits. This would be nice to have since those global phases become local phases if the circuits are used as sub-circuits, and it would also make the transpiler service inline with what Qiskit itself does.

[cbjuan]

Thanks for reporting this @nonhermitian. We are looking to fix this in the Qiskit transpiler service.