Added a header to the cycle detection class

Author: Justin Wetherell

src/com/jwetherell/algorithms/graph/CycleDetection.java

@@ -6,6 +6,11 @@
 
 import com.jwetherell.algorithms.data_structures.Graph;
 
+/**
+ * Cycle detection in an undirected graph using depth first search.
+ * 
+ * @author Justin Wetherell <phishman3579@gmail.com>
+ */
 public class CycleDetection {
 
     private static Set<Graph.Vertex<Integer>> visitedVerticies = new HashSet<Graph.Vertex<Integer>>();