Transfer JS: Enable paths that don't start with /

refs #7133

Duracloud 'paths' may not start with /. Update JS to not insert /'s at the
start of every path.
Config fixes for Ubuntu 14.04

refs #7293

Apache now expects sites-[available|enabled] to end in .conf, so update dev
creation to create 000-default.conf

Gearman no longer creates a PID file that can be checked for. Instead,
check for the existance of the gearman process directly.
Dev-install: Do not install AtoM 1.3
Upstart: Add timeout waiting for Gearman
Templates: Remove load url from future

refs #7305

Not needed in Django 1.5, deprecated in 1.7
ATK: Replace django's simplejson with json

refs #7305

Deprecated in Django 1.7, and builtin json module is equivalent.
Dashboard: Update mimetype to content_type in HttpResponse

refs #7305

mimetype is deprecated in Django 1.7, replaced by content_type
ATK: Update Form to take advantage of ModelForm

Use ModelForm's ability to autogenerate fields from the Model, instead
of redefining fields. Move labels and choices to the model.
Forms: Add fields listing to all ModelForms

refs #7305

Django 1.7 no longer defaults to fields being everything because that
is a security risk. Add explicit specification of fields to all
ModelForms.
Update WSGI, manage.py for Djange 1.7

refs #7305
Models: Set defaults on BooleanFields

refs #7305
Django: Update to 1.7

refs #7305

Update Django and Tastypie versions. Update test runner default to
suppress warnings. Update all client scripts to initialize Django
before using the ORM.