Add a view to collect email for newsletter subscription

The javascript in landing page will send the email to this view
via an AJAX POST request, then the view will add this email to
the subscription list via SendGrid's API.
Merge branch 'develop' into sendmail

Conflicts:
	findtheco/apps/findthecoapp/static/js/landing2.js
Merge pull request #23 from liamlin/sendmail

Add a view to collect email for newsletter subscription