Fix a couple of compile issues

examples/src/main/java/example/PagingPatientProvider.java

@@ -60,6 +60,11 @@ public class PagingPatientProvider implements IResourceProvider {
             // Typically this method just returns null
             return null;
          }
+
+			@Override
+			public String getUuid() {
+				return null;
+			}
       };
    }
 

hapi-fhir-base/src/main/java/ca/uhn/fhir/rest/method/HistoryMethodBinding.java

@@ -171,7 +171,7 @@ public class HistoryMethodBinding extends BaseResourceReturningMethodBinding {
 		return new IBundleProvider() {
 			
 			@Override
-			public InstantDt getPublished() {
+			public IPrimitiveType<Date> getPublished() {
 				return resources.getPublished();
 			}
 			

hapi-fhir-base/src/main/java/ca/uhn/fhir/rest/server/IBundleProvider.java

@@ -1,5 +1,7 @@
 package ca.uhn.fhir.rest.server;
 
+import java.util.Date;
+
 /*
  * #%L
  * HAPI FHIR - Core Library
@@ -23,6 +25,7 @@ package ca.uhn.fhir.rest.server;
 import java.util.List;
 
 import org.hl7.fhir.instance.model.api.IBaseResource;
+import org.hl7.fhir.instance.model.api.IPrimitiveType;
 
 import ca.uhn.fhir.model.primitive.InstantDt;
 
@@ -34,8 +37,10 @@ public interface IBundleProvider {
 	 * if the method is invoked with index 0,10 the method might return 10 search results, plus an
 	 * additional 20 resources which matched a client's _include specification.
 	 * 
-	 * @param theFromIndex The low index (inclusive) to return
-	 * @param theToIndex The high index (exclusive) to return
+	 * @param theFromIndex
+	 *           The low index (inclusive) to return
+	 * @param theToIndex
+	 *           The high index (exclusive) to return
 	 * @return A list of resources. The size of this list must be at least <code>theToIndex - theFromIndex</code>.
 	 */
 	List<IBaseResource> getResources(int theFromIndex, int theToIndex);
@@ -60,7 +65,7 @@ public interface IBundleProvider {
 	/**
 	 * Returns the instant as of which this result was valid
 	 */
-	InstantDt getPublished();
+	IPrimitiveType<Date> getPublished();
 
 	/**
 	 * Returns the UUID associated with this search. Note that this
@@ -68,7 +73,11 @@ public interface IBundleProvider {
 	 * {@link IPagingProvider} is being used that requires UUIDs
 	 * being returned.
 	 * <p>
-	 * Otherwise you may simply return {@code null}
+	 * In other words, if you are using the default {@link FifoMemoryPagingProvider} in
+	 * your server, it is fine for this method to simply return {@code null} since {@link FifoMemoryPagingProvider}
+	 * does not use the value anyhow. On the other hand, if you are creating a custom
+	 * [@code IPagingProvider} implementation you might use this method to communicate
+	 * the search ID back to the provider.
 	 * </p>
 	 */
 	public String getUuid();

hapi-fhir-structures-hl7org-dstu2/src/test/java/ca/uhn/fhir/rest/server/SearchHl7OrgDstu2Test.java

@@ -160,6 +160,11 @@ public class SearchHl7OrgDstu2Test {
 				public int size() {
 					return 0;
 				}
+
+				@Override
+				public String getUuid() {
+					return null;
+				}
 			};
 		}