[WIP] fix version constraint to doctrine/phpcr-odm package

The setFallbackLocales() method in the locale chooser of the doctrine/phpcr-odm package was first added on March 1st. Thus, 1.1.0-RC1 or higher of doctrine/phpcr-odm is required.

Unfortunately, this proposed change doesn't solve the issue. As you can see [here](https://travis-ci.org/xabbuh/SeoBundle/jobs/27011434), Composer isn't able to resolve the dependencies.
I don't think that this will work. Because of the ``minimum-stability`` option, Composer will then fall back to an earlier development version of the package. This would then lead to failing tests since the ``setFallbackLocales()`` method wouldn't exist. What do you think?