Merge pull request #366 from zhx828/fix-token-issue

Give a default when initializing new Token model

Author: zhx828

src/main/java/org/mskcc/cbio/oncokb/domain/Token.java

@@ -40,7 +40,7 @@ public class Token implements Serializable {
 
     @NotNull
     @Column(name = "current_usage", nullable = false)
-    private Integer currentUsage;
+    private Integer currentUsage = 0;
 
     @ManyToOne
     @JsonIgnoreProperties("tokens")