Rename module jwutil to jwutils

Signed-off-by: Jan Lindemann <jan@janware.com>

test/mute-stdio/main.py

@@ -1,11 +1,11 @@
-import jwutil
+import jwutils
 
 print "This is without muted output"
 
-with jwutil.MuteStdIO():
+with jwutils.MuteStdIO():
     print "This is with muted output"
 
-with jwutil.MuteStdIO():
+with jwutils.MuteStdIO():
     print "This will have an error"
     print "Second suppressed line of output"
     print "Third suppressed line of output"