Add Select2 to List of posts

#3861


BEFORE:

![terms1](https://f.cloud.github.com/assets/3273122/1279172/eaa78490-2f30-11e3-8493-c819952f476f.png)




AFTER:

![terms2](https://f.cloud.github.com/assets/3273122/1279129/d3e42a2a-2f2f-11e3-908f-9320f43fd048.png)