[manual] API add_subscriptions: Change arguments to support options.

Since in the future we might want requests to add subscriptions to
include things like colors, in_home_view, etc., we're changing the
data format for the add_subscriptions API call to pass each stream as
a dictionary, giving a convenient place to put any added options.

The manual step required here is updating the API version in AFS
available for use with the zephyr_mirror.py system.

(imported from commit 364960cca582a0658f0d334668822045c001b92c)

examples/subscribe

@@ -48,4 +48,5 @@ if options.streams == "":
     print >>sys.stderr, "Usage:", parser.usage
     sys.exit(1)
 
-print client.add_subscriptions(options.streams.split())
+print client.add_subscriptions([{"name": stream_name} for stream_name in
+                                options.streams.split()])