integrating work from @suskind
adding a "margin" option to Ink.Dom.Element.inViewport
change options, take advantage of InkEvent.throttle and InkElement.inViewport, adding _userCallback utility function
refactor, starting docs
small bugfixes
lazyload tests
simplifying tests a bit, adding use strict to them too
Placeholder option for adding default [src] to all elements.
random fixes
adding sample
random fixes
Merge branch 'develop' of github.com:sapo/Ink into develop
merging doc changes in