fixed style of ember data warning

Current:
![screen shot 2013-09-03 at 8 12 49 am](https://f.cloud.github.com/assets/12481/1073229/0bbc86c4-14a3-11e3-9bac-3a89630fba71.png)

Updated:
![screen shot 2013-09-03 at 8 12 37 am](https://f.cloud.github.com/assets/12481/1073231/14ab1926-14a3-11e3-8cc8-32e93dd8285a.png)