added ADMINS constant to base.py, this constant contains a tuple of admin email addresses. Django will send email to admins in this list when a 500 server error occurs. Also added 'django.middleware.common.BrokenLinkEmailsMiddleware' to the middleware classes block, this allows Django to email admins when a 404 occurs. There is also a commented out block called IGNORABLE_404_URLS which can be used to filter out noncritial 404 errors from being emailed. Also added text to the 403, 404, and 500 templates.
added the templates 403, 404, 500, with associated views for project
added 'mail_admins' to django.request handler
Merge branch 'develop' into feature/email_settings

# By Eric Parker
# Via Eric Parker
* develop:
  added 'mail_admins' to django.request handler
  added the templates 403, 404, 500, with associated views for project
  added ADMINS constant to base.py, this constant contains a tuple of admin email addresses. Django will send email to admins in this list when a 500 server error occurs. Also added 'django.middleware.common.BrokenLinkEmailsMiddleware' to the middleware classes block, this allows Django to email admins when a 404 occurs. There is also a commented out block called IGNORABLE_404_URLS which can be used to filter out noncritial 404 errors from being emailed. Also added text to the 403, 404, and 500 templates.