updating reqs to latest versions of key libs
new rawes ElasticException handling for signal
streaming back case file attachments
adding this branch to travis build
updating reqs to latest versions of key libs
updating reqs for django and celery and support libs

some celery issues were revealed and the lib upgrades were necessary
Add minimum version for django-dev-server

Anything lower than this causes the server to not start with Django
1.5.5 or higher.
switching requirements for rawes back to 0.4.0

by default any status_code > 400 throws an ElasticException - hmm
removing django digest from reqs since it's a sub
Revert "new rawes ElasticException handling for signal"

This reverts commit 8e84faffe1593d2a39e59c343a9e8baeaec958f8.
adding jenkins reqs