Merge pull request #173 from alex-seville/master

Require loading timeout extended and removed labelled statements
Merge pull request #174 from alex-seville/master

Label statement instrument fix+test and data-cover-timeout option
Added xhr warning
Merge pull request #176 from alex-seville/master

Give user warning about using file:// on CORS error
ensured unhandled exceptions are re-raised

this avoids silent errors
Merge pull request #177 from FND/reraise

ensured unhandled exceptions are re-raised
Updated CORS error code for FF
experimental loader code
Added file uploader workaround