Removes UIDevice uniqueIdentifier call

As of Xcode 6, uniqueIdentifier is not available to 3rd
party vendors.
Merge pull request #65 from calabash/feature/remove-unique-identifier-call

Removes UIDevice uniqueIdentifier call
Updated Calabash JS submodule
Merge pull request #66 from calabash/calabash-js-fix-bounding-rect

Updated Calabash JS submodule
CI tests should be against develop branches
Pass TRAVIS env var to system calls
Merge pull request #67 from calabash/feature/ci-tests-should-run-against-develop-branches

Feature/ci tests should run against develop branches
Bump server version to 0.10.1
Adds a contributing guidelines
Merge pull request #68 from calabash/release-0.10.1

Release 0.10.1