Add 'client' string to our missing integrations.

Not done: Jira, Nagios

(imported from commit 3e2505653b377f8c307745e507bdc40e980dca05)

api/integrations/git/post-receive

@@ -36,6 +36,7 @@ import os.path
 
 sys.path.insert(0, os.path.dirname(__file__))
 import zulip_git_config as config
+VERSION = "0.9"
 
 if config.ZULIP_API_PATH is not None:
     sys.path.append(config.ZULIP_API_PATH)
@@ -44,7 +45,8 @@ import zulip
 client = zulip.Client(
     email=config.ZULIP_USER,
     site=config.ZULIP_SITE,
-    api_key=config.ZULIP_API_KEY)
+    api_key=config.ZULIP_API_KEY,
+    client="git " + VERSION)
 
 # check_output is backported from subprocess.py in Python 2.7
 def check_output(*popenargs, **kwargs):