Add test to verify issue #17

Author: Anil Maurya

test/fast_jsonparser_test.rb

@@ -77,4 +77,9 @@ def test_nested_usage
       break
     end
   end
+
+  def test_large_integer_parsing
+    result = FastJsonparser.parse("[{ \"duration\": 7386425359 }]")
+    assert_equal result[0][:duration], 7386425359
+  end
 end