Merge pull request #75 from wishtack/hotfix-embeddedlistfield-attribute

BUGFIX: The 'attribute' argument of EmbeddedListField was ignored.
PEP8 love.
reorder_suite moved to django.test.runner module
django test client responses no longer have a url attribute for api calls with the location header.  Replaced call to assertRedirect with individual checks of status code and loction header value
modified requirements to test upgrade to tastypie version 0.12.0
fixed travis env
fixed travis env
fixed django tastypie requirement for tests
fixed get_via_uri for polymorphic resources, reset resource._meta.resource_name after _wrap_polymorphic is called
pep8 compatibility
added travis test environments
reorder_suite moved from django.test.simple to django.test.runner, handle ImportError or reoder_suite to keep backwards compatibility with previous versions of Django
removed django.test.runner import
python2.6 isn't compatible with django1.7.
django 1.4 isn't compatible with tastypie 0.12
Removed higher version constraint for 'django-tastypie' and 'mongoengine'.
testing travis.yml python requirement matrix
travis.yml matrix excludes python2.6 for django1.7, allows django1.7 and tastypie 0.10 to fail
fixing travis.yml exclusion matrix
tastypie <0.11.0 is allowed to fail with django 1.7.