LPS-34551 - Message Board: The table is abnormal in CKeditor

Hey @natecavanaugh,

Attached is an update for http://issues.liferay.com/browse/LPS-34551.

Screenshots:

Before CSS changes:
![before](https://f.cloud.github.com/assets/860951/416158/be292b16-ac46-11e2-8fe5-d155674885f8.png)

After CSS changes:
![after](https://f.cloud.github.com/assets/860951/416160/c3a6d39a-ac46-11e2-88a4-97ca6b1759b6.png)

Please let me know if you have any questions.  Thanks!