Last commit broke custom peel sizes

I had a bug on flash that broke custom peel sizes in last commit when I included the SWF files support.

It is just solved I would commit it soon but I'm going to try to solve another issue first. By now you can't disable a sound ones you configure a pageear to use it (load sound, open sound or close sound). Sounds should be optional and an option to disable them should be available when you don't want to use it anymore on a pageear.

For images I prefer them to be mandatory so if someone for any reason does not want and image he can just upload a one pixel transparent png or gif.

I have improved the close button too including a mouse over effect that changes its color.

I'm going to work on sounds issue and then commit the corrected dev version.