Remove variable dependency for metadata field names and store all
in a MetaFields object. Also remove deprecated methods for
metdata field access.

Change-Id: I55f4ab7ada7c94a7b6c5211a43a6e5a9dd6c2260
diff --git a/pom.xml b/pom.xml
index 3cb6196..9dc796b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,7 +35,7 @@
 
 	<groupId>de.ids_mannheim.korap</groupId>
 	<artifactId>Krill</artifactId>
-	<version>0.58.3</version>
+	<version>0.58.4</version>
 	<packaging>jar</packaging>
 
 	<name>Krill</name>