Sqcircuit

Bug Fixes
* A Bug fixed related ``Circuit.description()`` method for circuit without loops.

Under the Hood
* Added test module to ``conftest.py`` to check that if ``Circuit.description()`` runs without error for all qubits.

Bug Fixes
* A Bug fixed related to misspelling of variables in ``Circuit.loop_description()`` method.

Under the Hood
* Added test module for ``Circuit.description()`` and ``Circuit.loop_description()`` methods.
* Added test module for ``Circuit.eig_phase_coord()`` method.
* Created ``noise.py`` for handling of noise and environment properties of the circuit.
* Added test module for ``noise.py`` method.
* Quantum operators and ``circuit.py`` module are reorganized for future developments.

Releasing to public
* First open-beta release of SQcircuit to public.
* Uploading SQcircuit theory paper to arXiv.

Bug Fixes
* bug fixed related to parallel JJ in ``description()`` method.
* bug fixed related to only LC circuit.

Changes
* changed function names to PEP 8 Style.

* change the ``eig()`` method back to ``diag()``

* change ``description()`` method to support Latex displaying for Jupyter notebook environment.
* change ``fluxDist`` default option to ``"junctions"`` for ``circuit()`` method.
* change ``diag()`` method name to ``eig()``.