rtex/prawn incompatability

if you are using prawn and the prawnto plugin to create some PDF's in your app, and then add rtex to do others, rtex takes over and breaks prawn.

Apparently rtex takes over whenever a PDF is created. If you create a PDF from a view with .pdf.prawnto extension, you get a 500 error, when you look in the directory with the tex file it leaves it is really the PDF that was created, but rtex takes the PDF before you get it, changes the extension to tex and tries to pass it to pdflatex.