Integrate with AWS SES

[drj11]

Enables email on Amazon.

This now works (phew!) at least for me when I start a fresh stack and I register a new refinery account.

[drj11]

Note: The URL in the email that you get is wrong:

[codecov-io]

Current coverage is 22.08%

Merging #899 into develop will not affect coverage as of 47448b7

@@            develop    #899   diff @@
=======================================
  Files           209     209       
  Stmts         17769   17769       
  Branches       1010    1010       
  Methods                           
=======================================
  Hit            3925    3925       
  Partial           0       0       
  Missed        13844   13844       

Review entire Coverage Diff as of 47448b7

Powered by Codecov. Updated on successful CI builds.

[drj11]

Fix #836