Update mws/mws.py

Fixing deprecation warning: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6
Merge pull request #6 from mpatek/master

updated mws.py replacing e.message with str(e) on line 170
Fixed Issue #7

The default value for "condition" in get_lowest_offer_listings_for_asin is "Any" not "All".
Thanks @bolus.
Merge remote-tracking branch 'upstream/dev' into develop