Fixup some config settings.

Dunno how to abstract away the path to the EB cred file listed in
.elasticbeanstalk\config...
More avatar support.

Make a spot to store avatar files (both locally & in S3).  Hook that
location up to the templates, so avatars show up.
Add support for avatar upload.

As usual, the UI sucks, but all the raw functionality is there.  On the
profile page, click 'Change Avatar' to change avatar.  So far, only
upload from local machine is supported.