Added args test. Fixed code style error. Fixed missing import bug in unit test.
added a few more tests for pauli module. fixed bug in unit test.
fix white spaces
added newline at end of file
removed trailing white space
added docstrings and docstring tests/examples
Merge branch 'physics.quantum.pauli' of github.com:jrjohansson/sympy into physics.quantum.pauli
added more unit tests for pauli sigma operators
added more unit tests for quantum pauli operators
Added test for multiplications with identity operators. Added __rmul__ to IdentityOperator.
Merge branch 'physics.quantum.pauli' into physics.quantum.boson-multimode
Merge branch 'physics.quantum.boson-multimode' of github.com:jrjohansson/sympy into physics.quantum.boson-multimode