Fix updating page placeholder values

[mlocati]

When we publish to "Import Batches", we need to update the {ccm:export:page:...} placeholders with the final paths of the pages.

Fix #65

[hissy]

@mlocati Hmm, that's strange. Anyway, you should update the package version to refresh doctrine entities.

[mlocati]

@hissy what about ce2e5f8?

[hissy]

@mlocati I think just updating the package version is enough. Concrete will handle migrating entities automatically.

[mlocati]

That's a migration that can't be handled automatically: I added a new field to a database table, and the existing rows should have that field set automatically to the value of another field.