First tries to solve #274
Merge branch 'master' into issue_274
Required div.tile-content for AJAX edit
First ajax edit test
Test for banner tile: save via ajax
Added test for banner tile and richtext tile
Test for basic and collection tiles with ajax save
Test for embed and file tiles with ajax save
Closes issue #278
Revert "Remove inline style"

This reverts commit a7674db6a7d608c62c960500ee76bd8e0b8e9dce.
Revert "Done"

This reverts commit 4102bff6453b91dfc8a834f7d8d09f82af49a766.
Remove inline style
Refactoring validation
Revert "Remove inline style"

This reverts commit a7674db6a7d608c62c960500ee76bd8e0b8e9dce.
Revert "Done"

This reverts commit 4102bff6453b91dfc8a834f7d8d09f82af49a766.
Remove inline style
Revert "Refactoring validation"

This reverts commit 866c5570ba14d457620da41a1b29488e3bb911ee.
Return a thumbnail only if the item has an image field and the field is visible

closes #278
Update change log
Merge pull request #279 from collective/issue_278

Do not break if item has not image field