product_form created by helper function

So there aren't multiple locations all making their own version of the
product form
There are problems with this...

Having a hidden textarea in the dom and cloning it seems to confuse
tinymce.
Gonna try having the html as a var.
tinymce fixes

get tinymce to work with dynamically added textarea
improvements to add and remove product
misc changes to brand edit / create
Cleaned up Edit Brand code