[refs #124] Moved private keys to secrets.sls
New reCAPTCHA key pair.
[fix tests] For testing and local dev we do not need to have email
server settings.
[fixes #124] Added new keys to secrets.ex
[fixes tests] Added RECAPTCHA_PRIVATE_KEY to test.py settings.
[codereview] Change secret varaible name.

RECAPTCHA_PRIVATE_KEY added for testing locally.
Merge pull request #125 from openrural/feature/124-hide-credentials

[refs #124] Moved private keys to secrets.sls