Partially fixed issue with FF resize handlebars
Partially fixed issue with FF resize handlebars

In FF52 when copy and pasting images sometimes disableGeckoResize is run
after new native resize handlebars have already been added. These should
now be removed when TinyMCE updates the resize rectangle it uses.

FernCreek/tinymce,FernCreek/tinymce,FernCreek/tinymce