If you are using EAP, or a custom built version of AS7 upstream you should be able to get it to work by adding this into your jboss-deployment-structure.xml:
<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.2">
<deployment>
<exclude-subsystems>
<subsystem name="resteasy" />
</exclude-subsystems>
</deployment>
</jboss-deployment-structure>
Unfortunatly this was added after 7.1.1, however it basically means that the container will not add resteasy into your deployment, or attempt to do any jax-rs integration.