Refactor loadDeps to Module.prototype._load method to reduce closure
Rename cachedModules to cachedMods
Reduce RegExp to improve performance
Rebuild packages
Memoize normalize function
Rebuild packages
Fix a bug for _load context
Remove memoizing for id2Uri function
Fix a bug for normalize function
Rebuild packages
Enhance $ fixing
Fix logic bug of normalize function
Refactor to Module.prototype._load and _fetch function to reduce closure
Comment rare case
DO NOT check invalid uris
Update test specs for api changing
Rebuild packages
Little style tweak