Allow executing bower as root; for running within docker.

Commit ready for merge.
 - Legacy-Id: 19130

Author: larseggert

djangobwr/management/commands/bower_install.py

@@ -79,7 +79,7 @@ def bower_install(self, bower_json_path, dest_dir):
         print("Installing from %s\n" % bower_json_path)
 
         # bower args
-        args = ['bower', 'install', bower_json_path,
+        args = ['bower', 'install', bower_json_path, '--allow-root',
                 '--verbose', '--config.cwd={}'.format(dest_dir), '-p']
 
         # run bower command