Add support for extracting sources from eggs.
Add support for extracting sources from eggs.

googleapis/oauth2client,jonparrott/oauth2client,jonparrott/oauth2client,googleapis/google-api-python-client,googleapis/google-api-python-client,clancychilds/oauth2client,google/oauth2client,googleapis/oauth2client,google/oauth2client,clancychilds/oauth2client