make it possible to access the fileSherpa instance by calling jQuery.fileSherpa() with no args. also, factor out the code for starting the upload so it can be called from elsewhere
make it possible to access the fileSherpa instance by calling jQuery.fileSherpa() with no args. also, factor out the code for starting the upload so it can be called from elsewhere

jamesgolick/file-sherpa,jamesgolick/file-sherpa