Scope to order ShortUrls by visit count
Use visit ordering scope in ShortUrls display
Require users to confirm their email addresses
Only allow @unep-wcmc.org emails to register
Merge branch 'wcmc-next' into wcmc-next-short-url

* wcmc-next:
  Only allow @unep-wcmc.org emails to register
  Require users to confirm their email addresses
  Use visit ordering scope in ShortUrls display
  Scope to order ShortUrls by visit count

Conflicts:
	app/models/short_url.rb