Review/revise Modaal load process

[cbotman]

See ticket #33 for some background. In short, this JS Fiddle example (https://jsfiddle.net/mouvcbgq/) fails in part because Modaal is being loaded in a body onload event, and internally Modaal calls $.fn.modaal in its onload event before $.fn.modaal is declared (due to the order in the source code).

As such, it'd be good to review/revise any onload related events in Modaal so that the library can be included at any stage after jQuery is loaded, and it'll just work. For one thing, this will make JSFiddle examples easier as most people won't know to change the JavaScript On Load setting in JSFiddle (and shouldn't be expected to).

[cbotman]

Before: https://jsfiddle.net/mouvcbgq/
After: https://jsfiddle.net/mouvcbgq/19/