yammer/yam — pull request #33 by ts-3156 (2014-02-03 12:55:47+00:00)
Title: convert 'cc user_ids' to valid format

convert 'cc user_ids' to valid format.

```
# before
cc is not converted.

# after
cc = [1, 2] -> cc is "[[user:1]], [[user:2]]"

```