Made script loader complete callback capable with ie8
Jshint scriptloader
Preemptive bugfix for IE6
http://www.stevesouders.com/blog/2010/05/11/appendchild-vs-insertbefore/#comment-2084
Early return to decrease nesting
Merge pull request #232 from jwplayer/bugfix/ie8-compatible-scriptloader

Made script loader complete callback compatible with ie8