SWI-8574 Add wait to StopStream Verb (#160)

Author: ckoegel

src/Bandwidth.Standard.Test/Unit/Model/Bxml/TestStopStream.cs

@@ -10,10 +10,11 @@ public class TestStopStream
 		[Fact]
 		public void StopStreamTest()
 		{
-			var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StopStream name=\"test\" /></Response>";
+			var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StopStream name=\"test\" wait=\"true\" /></Response>";
 
 			var stopStream = new StopStream();
 			stopStream.Name = "test";
+			stopStream.Wait = true;
 
 			var response = new Response(stopStream);
 			var actual = response.ToBXML();

src/Bandwidth.Standard/Model/Bxml/Verbs/StopStream.cs

@@ -14,5 +14,11 @@ public class StopStream : IVerb
         /// </summary>
         [XmlAttribute("name")]
         public string Name { get; set; }
+
+        /// <summary>
+        /// If true, the BXML interpreter will wait for the stream to stop before processing the next verb.
+        /// </summary>
+        [XmlAttribute("wait")]
+        public bool Wait { get; set; }
     }
 }