refactor flash messaging, added item name to flash messages
removed setFlash method
renamed variables to follow coding standards
Merge remote-tracking branch 'origin/master' into item_name_in_flashes

Conflicts:
	Controller/CRUDController.php
	Resources/views/standard_layout.html.twig
cs
Trigger event before removing element
Update preview_mode.rst
Update preview_mode.rst
added some preview mode screenshots
cropped screens
Update preview_mode.rst
Update preview_mode.rst
Update preview_mode.rst
Merge remote-tracking branch 'base/master'

Conflicts:
	Resources/doc/reference/preview_mode.rst
add wip recipe for custom action
resolve show_in_dashboard in parameter bag
Added code to generate the full path to the image preview

The image entity can't generate the full path as it doesn't know the location of the web directory.
Added link to SonataPropelAdminBundle in README.md
Fixed title
Merge pull request #1768 from pborreli/patch-4

Fixed title