Add "spdns.de" and "duiadns.net" services

Add "spdns.de" and "duiadns.net" services

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>
delete editor backup file

delete editor backup file
only start via hotplug not via boot 

Hotplug script will start service for each interface.
To prevent duplicates and in general must not start on boot.
start via hotplug only if enabled

To be consistent with other services only start via hotplug if enabled.
Now full functionality of /etc/init.d/ddns enable/disable start/stop

Optimization: Include script only if needed
Add PKG_LICENSE and MAINTAINER

Add PKG_LICENSE and MAINTAINER and update PKG_RELEASE
Merge pull request #312 from chris5560/for-14.07

For 14.07 ddns-scripts: Implement latest fixes and updates from trunk