Testcase for ebean with circular dependences

1. While the javax.persistance api discourages the use of bidirectional
   cascades, it does not prohibit them. They're very useful and natural
   if you think of the database as a graph instead of a tree.
   test case 1 (testCircularCascade) tests this.
2. Second test case fetches the child, but saves the parent. If used like
   that, the child will not have it's changes saved.

src/test/java/org/tests/update/objects/Parent.java

@@ -0,0 +1,43 @@
+package org.tests.update.objects;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import javax.persistence.Table;
+import javax.persistence.Version;
+
+@Entity
+@Table(name = "e_save_test_c")
+public class Parent {
+  @Id
+  private Long id;
+  @Version
+  private long version = 0L;
+  @OneToOne(cascade = CascadeType.ALL)
+  private Child child;
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public long getVersion() {
+    return version;
+  }
+
+  public void setVersion(long version) {
+    this.version = version;
+  }
+
+  public Child getChild() {
+    return child;
+  }
+
+  public void setChild(Child child) {
+    this.child = child;
+  }
+}