Fixed up the health check page

app.py

@@ -1,7 +1,6 @@
 import os
 from flask.ext.script import Manager, Server
-from flask_migrate import Migrate, MigrateCommand
-from app import (create_app, get_app_version)
+from app import create_app
 
 
 application = create_app(os.getenv('NOTIFICATIONS_ADMIN_ENVIRONMENT') or 'development')
@@ -17,13 +16,5 @@ def list_routes():
         print("{:10} {}".format(", ".join(rule.methods - set(['OPTIONS', 'HEAD'])), rule.rule))
 
 
-@manager.command
-def app_version():
-    """
-    Retrieve the version of the api.
-    """
-    return get_app_version()
-
-
 if __name__ == '__main__':
     manager.run()