Contribution: circles and hough transform

[François]

Hi,

On my spare time, I work on a code to implement a hough transform to detect 
circles. This is not implemented yet in skimage.
Is Skimage interested in this implementation? (I don't want to spend much 
more time to polish the code if there is no need)
If the answer is positive, it can be done in two steps:
* add a method to draw circles. The current "circle" method is for disks. 
We need circles (very easy to write). This is already done, but in pure 
python. I saw that drawing methods are implemented in cython. I have never 
used cython before, but it must be easy (I guess). I implemented two 
methods (Bresenham or midpoint circle and Andres), both are useful I think.
* write the hough algorithm for circle. Done for a Quick and dirty usage, 
but it's not suitable yet for integration (not safe).

I would prefer to send one patch per step. Even if I already tackled bugs 
in some projects, I never done this kind of contribution before ;)

François.

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