Remove strip from validators
Add strip to converter; remove unused converters
Add the whole schema to Publishers plugin
Move dataset validators order

_ignore_missing should be executed first otherwise the rest of
valiadators can fail if the field is missing.
Further work on the Publishers form

Finish schema for form to db and viceversa, add fields in templates. Add
helpers.
Add redirects for publishers

We can not handle it via IGroupForm, as we will lose the
group_type=organization property, so we need to explicitly set redirects
and mappings to map org actions to the organization controller.
Cleanup schema a bit
Merged ckan-2.x