Fix test_zipfile.py.  (Why was it passing before?)
The usual str/bytes issues.

BTW, perhaps zipfp.open() should behave more like io.open()?
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 63551a6..e1fdc7f 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -412,7 +412,7 @@
             # ugly check for cases where half of an \r\n pair was
             # read on the last pass, and the \r was discarded.  In this
             # case we just throw away the \n at the start of the buffer.
-            if (self.lastdiscard, self.linebuffer[0]) == (b'\r', b'\n'):
+            if (self.lastdiscard, self.linebuffer[:1]) == (b'\r', b'\n'):
                 self.linebuffer = self.linebuffer[1:]
 
             for sep in self.nlSeps:
@@ -479,9 +479,9 @@
         return result
 
     def read(self, size = None):
-        # act like file() obj and return empty string if size is 0
+        # act like file obj and return empty string if size is 0
         if size == 0:
-            return ''
+            return b''
 
         # determine read size
         bytesToRead = self.compress_size - self.bytes_read