Bump calabash-cumber dependency to 0.11.3

There is a known issue with touch events timing out when running calabash-ios 0.11.1 with Xcode 6.1 / iOS 8.x simulators. 0.11.3 fixes this issue. See https://github.com/calabash/calabash-ios/issues/566 for more info
Merge pull request #19 from shodanuk/patch-1

Bump calabash-cumber dependency to 0.11.3