Handle sys.stdin and sys.stdout encoding issues in python 3.x

This code will keep current behavior for python 2.x.

lib/github/commands/rest2html

@@ -45,6 +45,7 @@ except:
     pass
 import codecs
+import io
 from docutils import nodes
 from docutils.parsers.rst import directives, roles
@@ -164,7 +165,11 @@ def main():
     except IOError:  # given filename could not be found
         return ''
     except IndexError:  # no filename given
-        text = sys.stdin.read()
+        if sys.version_info[0] < 3: # python 2.x
+            text = sys.stdin.read()
+        else: # python 3
+            input_stream = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
+            text = input_stream.read()
     writer = Writer()
     writer.translator_class = GitHubHTMLTranslator
@@ -187,5 +192,9 @@ def main():
     return ''
 if __name__ == '__main__':
-    sys.stdout.write("%s%s" % (main(), "\n"))
+    if sys.version_info[0] < 3: # python 2.x
+        sys.stdout.write("%s%s" % (main(), "\n"))
+    else: # python 3
+        output_stream = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
+        output_stream.write("%s%s" % (main(), "\n"))
     sys.stdout.flush()