Wrong condition

This must be array_key_exists instead in_array on construct
datatable.
Undefined index db
Closed #83 Update to Zend Framework 2.2.1
Closed #84 Automatically open the treeview
\Gc\Core\Translator is no longer a Singleton.
Wrong conditions

We must check if form has data before getting them.
Missing saveCommand in javascript
Automaticly open treeview

If current document does not have children, get parent and open it.
CS
Remove Registry from helpers

Remove Registry calls from cdn, cdnBackend and script helpers.
Refactoring for unit testing.
Bug with checkbox

Checkbox must have method setCheckedValue parameter in string