Bump CouchDB4J

Our version of CouchDB4J has been updated to fix and improve type
handling for database keys. Strings are no longer converted implicitly
to integers or booleans based on their content. This lead to bugs if key
and property values were compared.

pom.xml

@@ -192,7 +192,7 @@
 		<dependency>
 			<groupId>de.thm.couchdb4j</groupId>
 			<artifactId>couchdb4j</artifactId>
-			<version>0.7</version>
+			<version>0.8</version>
 		</dependency>
 		<dependency>
 			<groupId>javax.servlet</groupId>