Make sure to wait for the switch to complete

Author: BonsaiDen

make

@@ -102,7 +102,8 @@ def merge_pages():
             git = subprocess.Popen(['git', 'checkout', 'gh-pages'],
                                     stdout=subprocess.PIPE)
 
-            print get_branch()
+            git.communicate()
+
             if get_branch() != 'gh-pages':
                 print 'ERROR: Failed to switch to gh-pages'
                 return 1