#115 - Mapping - Add support for @ElementCollection enhancement

Initial support - add simple Set support and Json support for simple List and Set.

src/main/java/io/ebeaninternal/server/deploy/ElementHelpMap.java

@@ -0,0 +1,28 @@
+package io.ebeaninternal.server.deploy;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+class ElementHelpMap implements ElementHelp {
+
+  @Override
+  public ElementCollector createCollector() {
+    return new Collector();
+  }
+
+  private static class Collector implements ElementCollector {
+
+    private Map<Object, Object> map = new LinkedHashMap<>();
+
+    @Override
+    public void addElement(Object element) {
+      throw new RuntimeException("asd");
+      //map.put()
+    }
+
+    @Override
+    public Object collection() {
+      return map;
+    }
+  }
+}