enabled multiArchive and multiBroadcast options for start_archive and start_broadcast methods

Author: maxkahan

README.rst

@@ -160,6 +160,13 @@ Warning: This value cannot be set for Individual output mode, an error will be t
   # Store this archive_id in the database
   archive_id = archive.id
 
+You can enable multiple simultaneous archives by specifying a unique value for the ``multi_archive_tag`` 
+parameter in the ``start_archive`` method.
+
+.. code:: python
+
+  archive = opentok.start_archive(session_id, name=u'Important Presentation', multi_archive_tag='MyArchiveTag')
+
 You can stop the recording of a started Archive using the ``opentok.stop_archive(archive_id)``
 method. You can also do this using the ``archive.stop()`` method of an ``Archive`` instance.
 
@@ -403,6 +410,36 @@ The live streaming broadcast can target one HLS endpoint and up to five RTMP ser
 
   broadcast = opentok.start_broadcast(session_id, options)
 
+To enable multiple simultaneous broadcasts on the same session, specify a unique value for the 
+``multiBroadcastTag`` parameter in ``options`` when calling the ``opentok.start_broadcast`` method.
+
+.. code:: python
+
+  session_id = 'SESSIONID'
+  options = {
+    'multiBroadcastTag': 'unique_broadcast_tag'
+    'layout': {
+      'type': 'custom',
+      'stylesheet': 'the layout stylesheet (only used with type == custom)'
+    },
+    'maxDuration': 5400,
+    'outputs': {
+      'hls': {},
+      'rtmp': [{
+        'id': 'foo',
+        'serverUrl': 'rtmp://myfooserver/myfooapp',
+        'streamName': 'myfoostream'
+      }, {
+        'id': 'bar',
+        'serverUrl': 'rtmp://mybarserver/mybarapp',
+        'streamName': 'mybarstream'
+      }]
+    },
+    'resolution': '640x480'
+  }
+
+  broadcast = opentok.start_broadcast(session_id, options)
+
 You can stop a started Broadcast using the ``opentok.stop_broadcast(broadcast_id)`` method.
 
 .. code:: python

opentok/opentok.py

@@ -484,7 +484,8 @@ def start_archive(
         output_mode=OutputModes.composed,
         stream_mode=StreamModes.auto,
         resolution=None,
-        layout=None
+        layout=None,
+        multi_archive_tag=None
     ):
         """
         Starts archiving an OpenTok session.
@@ -535,6 +536,8 @@ def start_archive(
         StreamModes.manual to explicitly select streams to include in the the archive, using the
         OpenTok.add_archive_stream() and OpenTok.remove_archive_stream() methods.
 
+        :param String multi_archive_tag (Optional): If specified, triggers a new simultaneous archive on the session. 
+
         :rtype: The Archive object, which includes properties defining the archive,
           including the archive ID.
         """
@@ -559,7 +562,8 @@ def start_archive(
             "hasVideo": has_video,
             "outputMode": output_mode.value,
             "resolution": resolution,
-            "streamMode": stream_mode.value
+            "streamMode": stream_mode.value,
+            "multiArchiveTag": multi_archive_tag
         }
 
         if layout is not None:
@@ -1314,6 +1318,8 @@ def start_broadcast(self, session_id, options, stream_mode=BroadcastStreamModes.
             String 'resolution' optional: The resolution of the broadcast, either "640x480"
             (SD, the default) or "1280x720" (HD)
 
+            String 'multiBroadcastTag' optional: If specified, triggers a new simultaneous broadcast on the session.
+
         :param BroadcastStreamModes stream_mode (Optional): Determines the broadcast stream handling mode.
         Set this to BroadcastStreamModes.auto (the default) to have streams added automatically. Set this to
         BroadcastStreamModes.manual to explicitly select streams to include in the the broadcast, using the