Merge pull request #120 from mchf/master

Merged fix from master. Cleanup.
Merge pull request #122 from mchf/master

Removed InterfaceHasAliases.
Merge pull request #123 from mchf/bnc847783-bridge-ports

Do not propose 'ifplugd' devices as bridge ports
Add CONTRIBUTING.md

See:

  * https://github.com/blog/1184-contributing-guidelines
  * http://lists.opensuse.org/yast-devel/2013-10/msg00052.html
remove privatelly exported attribute access
Merge pull request #127 from yast/change_devices_tests

remove privatelly exported attribute access
Always write firewall configuration
Updated changelog

Conflicts:
	VERSION
	package/yast2-network.changes