unload python plugins when geanypy is deactivated

[ghost]

This should fix bug #12
when the geanypy plugin's cleanup is called it closes the python plugin manager and unloads all the python plugins

[ghost]

You are completely right, sorry about that, first pull request on github.
I'll fix the leak tonight and ammend the indentation, my editor (set to auto) has used tabs instead of spaces.

[ghost]

I'll check to see if i can find a possible leak on _CallObject()

[ghost]

I call Py_DECREF on the result of the PyObject_CallObject, so it shouldn't leak now

[codebrainz]

What are all the extra commits/changes about?

[codebrainz]

I ask because I want to merge the unloading fix before next release but the PR looks a fair bit more involved since my last comments about the leaks.