implemented storage of new wiki page version, prepared page display for several versions

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/model/WikiPage.java

@@ -26,6 +26,10 @@ public class WikiPage implements Mappable {
 		this.content = content;
 	}
 
+	public String content(){
+		return content;
+	}
+
 	public String id(){
 		return id;
 	}
@@ -74,6 +78,10 @@ public class WikiPage implements Mappable {
 		);
 	}
 
+	public int version(){
+		return version;
+	}
+
 	public List<Integer> versions(){
 		return versions;
 	}