Upgrades the dependency on vCloud Core to 0.13.0

An error will now be raised if your `FOG_CREDENTIAL` environment
variable does not match the information stored against a vCloud Director
session referred to by `FOG_VCLOUD_TOKEN`, so as to guard against
accidental changes to the wrong vCloud Director organization.
Release version 1.3.0
Merge pull request #110 from gds-operations/78700334-upgrade_core

[#78700334] Release version 1.3.0