Remove iframe from unplugged pages

Before:

![image](https://cloud.githubusercontent.com/assets/206973/3607472/8a54e072-0d49-11e4-933a-1b918e3991c0.png)

After:

![image](https://cloud.githubusercontent.com/assets/206973/3607481/d75d6614-0d49-11e4-8a0f-65285a91e982.png)