Remove erroneous BOM

Closes WordPress-Coding-Standards/WordPress-Coding-Standards#38

$ grep -rl $'\xEF\xBB\xBF' .
./Sniffs/WhiteSpace/OperatorSpacingSniff.php
Merge branch 'master' into develop

Conflicts:
	Sniffs/WhiteSpace/OperatorSpacingSniff.php