Merge pull request #1 from simock85/master

axel.ready(function(){...}) register a callback that will be triggered when all scripts have been loaded
Avoid issues with head.js getAsset when callback is not passed as a parameter
Merge branch 'master' of https://github.com/amol-/axel
Make sure paths are loaded in specified order
Make ready work independently from the position where it's called, before or after load
Push newly created entry to avoid file name manipulation when calling .ready
Fix for IE8
Support for marking files as preloaded
stray framework specific call in README.rst example
fixed some tests broken by 8fff83efa935e116acb27edc60c21c5f633f86f2