filepicker_image_tag with width and height not rendering correctly

Using the ``` filepicker_image_tag ``` with a determined width and height, renders the html like so

![Screen Shot 2013-04-23 at 6 43 11 PM](https://f.cloud.github.com/assets/469507/417594/9dda8c8c-ac6f-11e2-9ed0-7f9925dbd338.png)

Making the image squared in every case.

I removed the options from the image_tag to solve this