Add openSUSE 13.2 to the supported systems
Adapt README.md to 13.2 support
Replaced supported platforms message by autogenerated one

Instead of refering to the Github README.md which is only available in
the git repository the message about the supported platforms is
generated from the code.
Use allow instead of expect in local_system

It does not make any sense to use expect just for stubbing purposes so I
replaced it by allow.
Merge pull request #366 from SUSE/support_opensuse_13_2-3

Support opensuse 13.2-3