Fix bug in Grid EditWindow when editing phantom record

The phantom record was deleted on cancel (although it was saved previously)
fix DisplayField modifying value on save
Remove view.on('success', ...) because it's not always set

Quickfix before presentation
Fix filters in storeConfig: they where shared across multiple stores

Problem was that storeConfig is an object and thus modified by reference
Merge branch 'master' of github.com:Ben-Ho/densajs