changes on item-table
added simple view for editable-data-row
replaced custom select by standard select
added helper util for parsing dates; adaptions in editable-data-row
implemented openOverlay function
cleanups
small bugfix; now showing plus icon when data is null
Merge pull request #6 from sulu-cmf/feature/item-table-adaptions

[FEATURE] Item-table adaptions and simple-view for editable-data-row