There is some old stuff in twython.py related to the detection of the callback_url parameter in the oauth2 library that is not needed anymore. These changes clean that up.
Removed OAuth library callback_url detection code, as callback_url pa…
…ssing does not depend on that anymore.
If callback_url is not set, don't force it to 'oob'
Fix adding callback_url for old style servers
Not sure if/when @ryanmcgrath will accept this, but if he does, you can remove import inspect as well; as it would be no longer needed.
Removed 'import inspect' as it is no longer needed.
Good catch Michael, thanks!
Merged, thanks all around!