try..except importing cStringIO instead of StringIO
added option to disable colour output

it messes with terminals without full colour support

Signed-off-by: mark hellewell <mark.hellewell@icloud.com>
Merge pull request #6 from markhellewell/master

use cStringIO and optionally disable colour
Removing the clint.colored stuff, home grown colouring thanks to SO
Added --lint to the readme file, even though it's not done yet