Use the default change list when in "popup" mode.
Updated travis and tox config to 1.4.14, 1.5.9, 1.6.6 and 1.7c3
Merge branch 'handle_popup_mode' of https://github.com/hstanev/django-mptt-admin into hstanev-handle_popup_mode
Changed label in tox config to django1.7-py27
Correctly import IS_POPUP_VAR for Django 1.4 and 1.5
Added issue 34 to changelog