Image resize

This uses the gem minimagick to resize pics when the url is provided.  The server reads the pic at the link and resizes it, storing the smaller pic on the server.  I added the resized pic to the Take Survey view too.

This is one way to do it.  I suggest Sara review it to see if this is a better option than whatever she is doing with CSS.  If so, feel free to merge.  

I think that in order to get this to work on your computers, you need to also install Image Magick.  I think the gem minimagick just calls on Image Magick.  Not sure of the process to install that for Macs.