fixing windows style paths and relative filesystem paths for Envjs.uri
accidentally removed document=null in the tests, restoring that
Incorporated filesystem path fixes for Windows file paths (as in
pull request #23, 031b304/b645a70 from moschel. Added Windows batch
files to run envjs using either Rhino or the Rhino debugger. Fixed
an issue in xhr.js Envjs.localXHR when running under Rhino, url
parameter was tested for pattern match to determine Content-Type,
but fails under Rhino since the url parameter passed is a Java
object, not a string.