Use cds-parent as parent project to avoid problems with release plugin

[MrSnyder]

Before this patch, the release plugin apparently didn't update the version of the deegree-webservices-cds project.

[robstek]

This patch result in a war containing deegree jars (in WEB-INF/lib) for versions 3.2-pre12 and 3.4-pre10-SNAPSHOT-cds1 mixed up. It does not run in tomcat7, java7.
The following error is generated when a workspace is initialized;

[15:09:22]  INFO: [DefaultWorkspace] Found resource manager FeatureStoreManager.
[15:09:22]  INFO: [DefaultWorkspace] Starting up resource manager FeatureStoreManager.
[15:09:22] ERROR: [OGCFrontController] Initialization failed!
[15:09:22] ERROR: [OGCFrontController] You probably forgot to add a required .jar to the WEB-INF/lib directory.
[15:09:22] ERROR: [OGCFrontController] The resource that could not be found was 'org/deegree/commons/config/AbstractBasicResourceManager'.