Use older version of webpack.

Current version seems to have issues with dependencies on Windows.
Ignore compiled script in Git.
Use ActiveX object for XHR in IE.

Standard XMLHttpRequest doesn’t work for file:// protocol in IE.
http://stackoverflow.com/questions/2142156/read-file-urls-in-ie-xmlhttprequest
Retrieve url property as attribute when datasets are not supported (e.g. in IE).