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Fix parsing error when css starts with BOM (#416)

When the css file starts with the Byte Order Mark and the first line is
@namespace, the parser fails:

|| <css input>:2:1: Unknown word
|| 	1:        /*** uncss> filename: tests/input/with_bom.css ***/
|| 	2:     -> @namespace testbom "http://bom.for_utf8.com";

This change makes sure we strip the BOM if it exists in the file

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