Cloud Storage Support

Adds support for delivery using Azure Blob Storage.

TLS 1.2+ Support without Django 3

See #263

Upgrades Django and removes TLS 1.0/1.1

Upgrades Django - #250
Disable TLS 1.0 and TLS 1.1 - #260
New users endpoint - #257

Allow longer zip downloads

Adds changes to refresh DDS token using the OAuth token - see #242

Zip download improvements

See #241

Includes transfer dates in delivery API responses

See #240

Adds email template set api endpoints

• Adds API endpoints for listing and using email template sets #239
• Upgrades django to 1.11.29 #236

Email template enhancements

Adds filters to allow splitting and retrieving a value. See #238

Fixes download service startup

See #235

Fix for users with missing emails

For users without email addresses derive one using their NetID #233