JCLOUDS-192. Move GCE to API v1beta15 - no new APIs added other than Zone/GlobalOperations, which are needed for zone-scoping changes.
JCLOUDS-192 - found a problem with paging list results for zone-scoped resources on 1.7.0, fixed it here too.
JCLOUDS-208: The datacenter link has been added to the Limits object construction.

This link is used in the 2.4 version of the Abiquo API to establish a relation
between an enterprise and the datacenter it is restricted to.
Removing OpenStack modules from Labs repo (now in jclouds-labs-openstack)

1.6.x version of https://github.com/jclouds/jclouds-labs/pull/18
Preparing jclouds.version for 1.6.2-incubating release
[maven-release-plugin] prepare release jclouds-labs-1.6.2-incubating-rc0
[maven-release-plugin] prepare for next development iteration
jclouds.version back to development version