Eliminates unnecessary dependency.
Renames "Result" to a semantically meaningful name, and cleans up wrapper.
Updates deps, bumps version.
Extracts logic from UserAgent classifier logic into a separate class.
Updates UserAgentClassifier to use new dClass wrapper wrapper; new wrapper uses a singleton classifier to avoid reloading the ~2MB device file every time a record is processed.
Updates device_class job.
Merge branch 'master' of github.com:wikimedia/kraken