Improved display of file size in dropdown.

The size of the files in the dropdown are sometimes dropped to a second row due to lack of space. See attached image.

![select-option-bad](https://cloud.githubusercontent.com/assets/487039/5518013/d8980038-890f-11e4-8ef6-dd00ae65788c.png)

This PR improves on this making sure that each filename and filesize are on the same line.

![select-option-good](https://cloud.githubusercontent.com/assets/487039/5518014/e600d088-890f-11e4-839d-6d4c1200f754.png)

I tried to adhere to the coding style in the project. I'll be glad to fix any incorrect formatting or naming convention if wanted.