Log Message:
py-cpplint: updated to 1.5.5

1.5.5:
Fix 172: Added 'size_t' to typecasts detected by CheckCStyleCast
Fixed wrong CLI help text: Each filter needs + or -
Fix 164: add elif as an exception for CheckSpacingForFunctionCall()
Fix google346: --root option not working on windows due to slashes in path