Beta - Jan 09th Release

Improvements:

• Enhanced case API for 3rd party case viewers and editors See PR #889
• Allow signup with promo codes See PR #888

Bug fixes:

• Fix roles POST cases. (#886)
• Assuming new users' roles in a more coherent way (#886)
• Removed unneeded log (#886)
• Copy main role check to on-the-fly assignee creation
• Add new unit types:
  • Other/Building
  • Other/Unit
  • Other/Room
  • Unknown/Building
  • Unknown/Unit
  • Unknown/Room

Misc:

• Improve documentation about email sending (#887)