restructed code for converting input from states to operators (only apply it to states, as opposed to everything that is not operators)
added process fidelity function
pep8 fixes
Revert "initial work on GRAPE implementation"

This reverts commit 1e61b728a3927754cc7090cb0e90e89d7537db01.

These changes were not intendent to be in this PR.
optionally do not normalize the process fidelity
Merge pull request #130 from jrjohansson/patch-metrics

Patch metrics
added process_tomography to init file
include control in module list in setup.py
merge after rebase