remove steadystate_nonlinear since it is too experimental still, and not suitable for a release
remove warning that only a single trajectory is ran when collapse operator are not given
quiet the warnings when cython files cannot be deleted (which can happen if they are already deleted, and its not a big deal and warnings is not necessary)
fixed numpy type handling for compability with windows
Merge pull request #185 from jrjohansson/code-cleanup

Code cleanup