1.0.7.rev16

bootstrap.js
* load event on iframe is firing after the thumbnails mutations occur so i dont add the observer until afterwards, i suspect this only affects slow computer SO solution to this was run `setThumbnailsTarget` on load as well as attach the mutations for future
* also i dont think i was removing the load event from the iframe so i added that now
* also neatened it a bit the code in this affected area