[FIX] FileUploader supports "multiple" attribute in IE >= 10

- FUP did not support the multiple attribute in IE browsers, works now
in IE10/11.

Change-Id: I4ce3bca43287926d0c00ed9bfdc7f67509ca347b
CSS: 0120061532 0001434587 2014
Merge "[FIX] FileUploader supports "multiple" attribute in IE >= 10"