remove image assets, which are not referenced (anymore) in our source code
move webalys icons into their own directory and add license file
well.. we don't need to change image path's in repository tests
Removes executable bit on remaining images.
added link to license text (cca for the framework, custom for the minicons for the webalys images
Merge pull request #456 from opf/feature/rails3_remove_all_the_images

copyright for image assets