utf-8 bom support.

pep8.py

@@ -1198,6 +1198,9 @@ def __init__(self, filename=None, lines=None,
                 self.lines = []
         else:
             self.lines = lines
+        bom = '\xEF\xBB\xBF'
+        if len(self.lines) and self.lines[0].startswith(bom):
+            self.lines[0] = self.lines[0][len(bom):]
         self.report = report or options.report
         self.report_error = self.report.error
 

testsuite/utf-8-bom.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+hello = 'こんにちわ'
+
+# EOF