add newRelic as subspec
add NewRelic subspec to podfile, install from local
implement setupNewRelicWithAppToken: and add and define ARNewRelicAppToken const
add and import NewRelicProvider
update CHANGELOG
Merge pull request #17 from confidenceJuice/addNewRelic

Add NewRelic
Merge branch 'addNewRelic'
Merge branch 'master' of github.com:orta/ARAnalytics