more tests done, couple of refactoring comments
Functional testing for core is complete
fixed bootstrapping export problem
can now set context for a dep chain using set/extendContext(). Removed the requirement that modules return a value. This is especially useful for modules that only exist to extend a context, like utility or constant modules
add support for forawrd reference with circular()
can now load stylesheets using 'styles' config property
Compatible with >= IE9. Added done() to act in place on onload function, which seem to have spoty support on IE9
getStyle now does nothing on empty url and some minor sytax stuff that was blowing things up in IE
structureJS.loadStyle() changed to allow callback to execute even without a valid sheet url. This is because structreJS.done() is fired in this callback.