Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into HEAD
implement datetimepicker
Merge pull request #317 from zavatskiy/datetimepicker

Datetimepicker
Update fields.py

Fixed #318.
Return a 403 if a view class's is_accessible returns false.
is_accessible says: Override this method to add permission checks.
This means that it should return forbidden since the item exists but you
are not allowed to see it
Merge pull request #320 from Trii/master-forbidden-on-not-accessible

Return a 403 if a view class's is_accessible() returns false.
Fix test that I missed
Merge pull request #322 from Trii/master-forbidden-on-not-accessible

I didn't think to check the tests . . . sorry!
Spanish translation
Merge pull request #323 from porduna/master

Add Spanish translation
fix sorting with null optional value
Merge pull request #325 from nikola-kocic/master

fix sorting with null optional value
sqla: consider any kind of relation in InlineModelConverter
Fixed #329. Embedded document now supports field configuration properties
Fixed #328. Check if local column is foreign key, if not - use remote column
Fixed #321. Time picker works now
Fixed #326. Added 'form_optional_types'
pass positional argument to inner
Fixed #278. Form rendering rules are now there.