Bugfix/datagrid editable

fixed various bug for release 

- [x] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | none
| Fixed tickets | yes
| Doc           | none

Fixed bug with possible multiple save actions

Issues that can be closed when merged:
- https://github.com/sulu-cmf/SuluTagBundle/issues/23
- https://github.com/massiveart/husky/issues/219
- https://github.com/sulu-cmf/SuluTagBundle/issues/14