Changes with Aloha.Editor 1.3.24

Bugfix SUP-2266

Fixed whitespaces at the start or end of an inline editable not being properly handled when deleting text.

Bugfix SUP-2184

When Drag & Drop was disabled, blocks with duplicate IDs inside nested editables
would sometimes get the class ui-state-disabled preventing any interaction
with them.

Note that blocks with duplicate IDs are not supported in Aloha-Editor since this
implies invalid HTML markup. This fix is just intended to prevent certain subsequent
errors when duplicate blocks are already present.