run tests on 3.3 unless django version is 1.4.10
support django 1.7 and mostly support 1.8
Merge pull request #86 from brad/33tests

run tests on 3.3 unless django version is 1.4.10
Merge branch 'django_1.7and8' of https://github.com/brad/django-import-export into brad-django_1.7and8
Merge branch 'brad-django_1.7and8'
Add @brad to AUTHORS
Adds customization hooks to ModelResource base code to set stage for RelatedModelImportable
Implements RelatedModelImportable
Updates demo project admin to showcase RelatedModelImportable
Adds integration tests for RelatedModelImportable
Adds tests for logic specific to RelatedModelImportable
Updates documentation to reflect new feature
Fixes _meta AttributeError in Django 1.5.*
Updates Changelog and Authors list
Returns user to original `change_form` view after using RelatedImport
Helps Resource's import code respect non-model-PK `import_id_fields` and perform appropriate updates instead of inserts
Refactors architecture issues raised by @bmihelac