IE8 support completion
Merge pull request #114 from guybedford/master

IE8 support
Prep for 0.5.4 release
fix source maps
update spec info
document instantiate spec
Made whitespace consistent in System's loader error messages.
Merge pull request #115 from masondesu/master

Made whitespace consistent in System's loader error messages.
Update README.md
Update README.md
fixes unminified build in firefox
Merge pull request #117 from bitovi/master

Fixes unminified build in firefox
include unminifid distribution version