Examples license

This pull request is about the 'license of the examples' ticket [1]. It contains some samples. Those samples were updated to match PEP8, unused import were removed, license statements were added, and the layouts were tweaked a bit. 

As I mentioned in another ticket...I would like to pack SimpleCV for the Fedora Package Collection. Fedora is a bit strict about the licensing topic in general. Missing license details in source files will make things more complicated during the package review, especially when those files can be used outside the actual package which is the case with the examples. The headers of the SimpleCV source code files is another issue for another place than this pull request. 

[1] https://github.com/sightmachine/SimpleCV/issues/543