Paging Bug fix and Junit updated.

BUG : feedResponse.getResponseContinuation(); used to throw NullPointerException. Hence continuation token could not be used to fetch subsequent pages.

Sample code:

FeedOptions options = new FeedOptions();
              options.setPageSize(5);
              FeedResponse<Document> feedResponse;
              Iterator<Document> iterator;
              int i;
              String continuationToken = null;
              
              System.out.println("REQUEST : 1");
              feedResponse = client.queryDocuments(collectionLink, "SELECT r.id FROM root r", options);
              iterator = feedResponse.getQueryIterator();
              i = 0;
              while (iterator.hasNext()) {
                     i++;
                     System.out.println(iterator.next());
                     if (i == 5) {
                           break;
                     }
              }
              
              continuationToken = feedResponse.getResponseContinuation();
              System.out.println("TOKEN : " + continuationToken);
              options.setRequestContinuation(continuationToken);
              
              System.out.println("REQUEST : 2");
              feedResponse = client.queryDocuments(collectionLink, "SELECT r.id FROM root r", options);
              iterator = feedResponse.getQueryIterator();
              i = 0;
              while (iterator.hasNext()) {
                     i++;
                     System.out.println(iterator.next());
                     if (i == 5) {
                           break;
                     }
              }

Exception Stack trace:

java.lang.NullPointerException
at com.microsoft.azure.documentdb.FeedResponse.getResponseContinuation(FeedResponse.java:222)
at com.microsoft.azure.documentdb.test.GatewayTests.testQueryIterableCrud(GatewayTests.java:289)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
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