Merge pull request #30 from lgleasain/master

Upping the rev of the gem to fix problems with older versions of rubyzip
tiny typo in readme: congigure -> configure
Merge pull request #31 from stereoscott/patch-1

tiny typo in readme: congigure -> configure
Made grocer version minimum required for passbook notifs

Grocer added passbook notifications for 0.3.0
https://github.com/grocer/grocer/commit/6d926ad9e7c5b7d03e5ca2b228bef4db640bc3db
Merge pull request #35 from NikoRoberts/patch-1

Made grocer version minimum required for passbook notifs
adding in ci support for the latest versions of ruby