Remove migrations from update script (this app has no DB).

bin/update_site.py

@@ -70,7 +70,6 @@ def update_site(env, debug):
         (EXEC,  GIT_PULL % vendor_branch),
         (EXEC,  GIT_SUBMODULE),
         (CHDIR, os.path.join(here)),
-        (EXEC, 'python2.6 vendor/src/schematic/schematic migrations/'),
         (EXEC, 'python2.6 manage.py compress_assets'),
     ]