delete unused files
reformat src/.jshintrc
reduce size of minified version
background addon: support $.lazyLoadXT.bgAttr attribute, fix $this definition to e.target
script addon: L/Lb/Le functions, use span instead of div, fix moving nodes
srcset addon: support data-srcset-ext attribute
remove blankImage option from simple version
test of addons loading
demo pages for addons
generate addons dist files
preparation for 0.8.5
0.8.5 dist
update README