Finite Radon Transform implemented

[Stéfan van der Walt]

Hi all,

Thanks to a beautiful patch by Gary Ruben, the 2-D Fast Radon
Transform is now included in the master branch:

http://github.com/stefanv/scikits.image/commit/e003726de26de276dc07bb2ac4fcfeed6493e17c

Thank you, Gary.

Enjoy!
Stéfan