made qpt availalbe even if matplotlib isnt found
removed duplicate entry in docstring
final pep8 fixes before release
have to comment out the addition of -w as compiler flag for released. somehow that breaks the build on my system, because the -fPIC flag is dropped, resulting in linking errors
namespacing and tolerance fixes in unit tests
Merge branch 'master' of github.com:qutip/qutip into qutip-2.2.X