moved Article model into utils project for sharing

vipra-cmd/pom.xml

vipra-rest/src/main/java/de/vipra/rest/model/Article.java

...ain/java/de/vipra/rest/provider/ObjectMapperProvider.java

...src/main/java/de/vipra/rest/resource/ArticleResource.java

...in/java/de/vipra/rest/serializer/ArticleDeserializer.java

...main/java/de/vipra/rest/serializer/ArticleSerializer.java

...a-rest/src/main/java/de/vipra/rest/serializer/Helper.java

vipra-util/.settings/org.eclipse.jdt.core.prefs

vipra-util/.settings/org.eclipse.jdt.ui.prefs

vipra-util/pom.xml

vipra-util/src/main/java/de/vipra/util/model/Article.java

vipra-util/src/main/java/de/vipra/util/model/Model.java