Fixed double-printing the favicon
Optionally set crossOrigin = 'anonymous'

crossOrigin = 'anonymous' will not send cookies with requests. This
can, for example, cause a login redirect which results in the cross
origin error the code tried to avoid in the first place.
Merge pull request #50 from mllocs/master

Fixed double-printing the favicon
Merge pull request #51 from PhilHarnish/optionalCrossOrigin

Optionally set crossOrigin = 'anonymous'
Upped to 0.6.1, minified