fix compile error in resource repository element interface
Merge pull request #154 from JarekW/dev

fix compile error in resource repository element interface
Datagrid option 'admin_edit_element_id' generates action that points to route 'fsi_admin_form' instead of 'fsi_admin_crud_edit'
Added 'element_id' option to every action in datagrid
Removed 'admin_element_edit_id' and 'admin_element_display_id' options from action column in favor of 'element_id' in each action
Renamed batch action option 'element_id' to 'element'
Added DisplayElement feature
Changed datagrid-bundle dependency to ~1.1
Removed useless code, updated docs
Updated batch element docs