[fix] parameterize similarity component

src/main/java/org/gradoop/famer/linking/similarityMeasuring/dataStructures/TFIDFSimilarityComponent.java

@@ -14,7 +14,7 @@ public class TFIDFSimilarityComponent extends SimilarityComponent {
     }
 
     @Override
-    public SimilarityComputation buildSimilarityComputation() throws Exception {
+    public SimilarityComputation<String> buildSimilarityComputation() throws Exception {
         return new TFIDF();
     }
 }