py23 fixes for psLib and t1Lib

Still not working with Python 3 as psLib's PSTokenizer subclasses
StringIO and expects it to have buf and pos.  Need to rewrite
this to implement StringIO internally.
diff --git a/Lib/fontTools/t1Lib.py b/Lib/fontTools/t1Lib.py
index aae86d9..abd4f32 100644
--- a/Lib/fontTools/t1Lib.py
+++ b/Lib/fontTools/t1Lib.py
@@ -338,17 +338,17 @@
 
 # Type 1 assertion
 
-_fontType1RE = re.compile(r"/FontType\s+1\s+def")
+_fontType1RE = re.compile(br"/FontType\s+1\s+def")
 
 def assertType1(data):
-	for head in ['%!PS-AdobeFont', '%!FontType1']:
+	for head in [b'%!PS-AdobeFont', b'%!FontType1']:
 		if data[:len(head)] == head:
 			break
 	else:
 		raise T1Error("not a PostScript font")
 	if not _fontType1RE.search(data):
 		raise T1Error("not a Type 1 font")
-	if data.find("currentfile eexec") < 0:
+	if data.find(b"currentfile eexec") < 0:
 		raise T1Error("not an encrypted Type 1 font")
 	# XXX what else?
 	return data