AUI-1669 - Image Viewer Base throws error when no images or sources are provided
AUI-1669 - Source formatting
AUI-1772 Adds scheduler demo with many events for perf testing
AUI-1772 Improve performance of SchedulerTableView plotEvents method

This is changing SchedulerViewTable to look for intersections in a single loop and caching them before it starts rendering the view. When the rendering is done, the cached values will be used and a lot of duplicate calculations will be avoided.
AUI-1772 Fixing popover performance problem

Clicking on existing events was taking a long while to open popovers. I profiled scheduler and noticed this was happening because setting paths on YUI causes the contents to be cloned, which is taking a long while. I changed the call to instead set the main attribute with the desired values and this is not slow anymore.
AUI-1722 Fixing bug with finding intersections with filter
AUI-1640 Scheduler should create SchedulerEvent instances lazily