Issue #2561225: Fix parsing and rewriting of PHP 5.4 syntax items

  Extra space before and after 'use' statement, e.g. " use namespace\path\to\item".
  Space after a variable name and the first index item, e.g. "$var ['key']".
  Handle an interface or class property named 'class'.
    The tokenizer returns this as T_CLASS instead of T_STRING.
    Ex: MyClassName::class.