Drop executable bit from images
Add addClass()/removeClass() utility functions
Add fullpage class to viewer element when in fullpage mode

Closes #61.
Rename test/util.js to test/test.js

since we are about to create a module for testing utility functions.
Add tests for addClass/removeClass
Test addition/removal of fullpage class on viewer element
Merge branch 'fullpage-class' of github.com:bgilbert/openseadragon into bgilbert-fullpage-class

Fixed Conflicts:
	test/test.html