Tests load settings file using absolute path.
This allows us to use nose to run individual tests,
  e.g. `nosetests eve.tests.auth`
Update to `auth_field` validation logic. This addresses #77 with the
results of the refactoring performed in #73. Added new methods to
`eve.io.mongo`: `_convert_query_objectids`, `combine_queries`,
`get_value_from_query`, and `query_contains_field`.
Merge branch 'develop' into auth_field_clobbering_filter
Fixed version numbers in docstrings
Updating `auth_field` logic to use `combine_queries` to add its
condition to the db query.
Fixed  &lt;&gt; in error message
Fixed auth_field 401 error message
Promoted ObjectId conversion to before `_datasource_ex`
in io.mongo.find_one. Removed `_convert_query_objectids`
since we don't use it any more.
Merge branch 'auth_field_clobbering_filter' of https://github.com/bcattle/eve into bcattle-auth_field_clobbering_filter
Docstrings fix.
Cleanup of User-Restricted Resource Access.
Merge branch 'bcattle-auth_field_clobbering_filter' into develop