Fix for main project not installing pods correctly.

Problem was that Podfile.lock was pointing to older version of the
SQKDatakit pod spec which didn't contain the necessary sub specs.
Updated Podfile to allow example project to build.
Merge pull request #22 from steprescott/pod-install-fix

Fix for main project not installing pods correctly.
Merge pull request #23 from steprescott/operation-example-project-fix

Updated Podfile to allow example project to build.