Updating pylint rc file to use the 'disable' key and include a few extra exceptions. This should fix failures to build with newer versions of pylint installed. Leaving the old 'disable-msg' line to keep compatibility with old instances of the tool (look to remove in the future).

Signed-off-by: Rob Dobson <rob@rdobson.co.uk>
Merge pull request #3 from rdobson/fix_pylint

Updating pylint rc file to work with newer versions of pylint