Merge pull request #3 from nicolaiarocci/develop

update
Merge pull request #4 from nicolaiarocci/develop

update
add missing MongoDB operators to the list
fix line length in operators list
Add $options and $list to MongoDB operators list.
Merge branch 'girogiro-develop' into develop
Fix outdated validation docs. Closes #456.
fix nullable media fields
Fix py26 failure for #460
Changelog update for #460
Exclude __pycache__ folders from builds
EVE_SETTINGS can now be used exclusively.

The EVE_SETTINGS envvar was supposed to be used in conjuction with
a settings file (to update it). Now the envvar can also be used
exclusively.

Closes #461.
Configuration Handling > Configuration
dev-requirements upgrade
New config setting for CORS Access-Control-Expose-Headers #467

Like the Access-Control-Allow-Headers directive allows the
the use of specific headers inside CORS requests, the
Access-Control-Expose-Headers directive allows access to
specific headers of the CORS response which are otherwise
inaccessible. A good example for this is the 'ETag' header
(that the client is interested in for sending it later inside
an 'If-Match' header).
This change makes the exposed headers configurable.
Remove obsolete test
Merge branch 'expose_headers' of github.com:maitai/eve into maitai-expose_headers
CORS ``Access-Control-Expose-Headers``
Merge branch 'maitai-expose_headers' into develop
flake8 compliance (fix line too long)