[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.
``1.1.0-beta`` and similar should be valid for ``1.1.*`` too since the minimum stability is ``dev``. For some reason, Composer decides that newer versions don't fit the overall dependencies. I think I saw a similar issue somewhere in another project. I try to catch it again. Could probably be an issue with Composer.