This reverts commit cc95bb27e873dc6140f9a909a57f075a0ef2f387.

Somehow sass did not follow the rails assets path order.
Therefore the default tail.scss would stay in effect even when
there was a different tail.scss in the customization folder.

Adding the customization stylesheet folder to the sass load_paths
works around this for now. Still need to check if it works in
production though.

* reran the simple form initializer.
* wrapped submit buttons are now broken and need a fix.
* disabled confirmation validation in client side validations as the
  error message always is attached to the wrong field.

The Active::Model modules of client side validations only get included
in CouchRest::Model::Base if the gems are loaded in the right order:

* activemodel is required first so the modules to extend are present
* client_side_validations is required next so its modules get included
* couchrest_model is required last so it includes the enhanced modules.
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our special error handler for json requests would turn all exceptions
into 500s - removed it. now the rescue_responses can do their thing
again.