fixed several pep8 issues

  * E265 block comment should start with '# '
  * E128 continuation line under-indented for visual indent
  * E713 test for membership should be 'not in'

Tested with pep8 version 1.5.6 (2014-04-14).

Change-Id: If2853c79bea91ebef5cd97dff66788b46b174a9a
Merge "fixed several pep8 issues"