Change staging url

Add getActivity promise generator

Add static id to uid mapping
Pull activities from staging.quill

Remove the static stories.json

Use a mapper function to map the old activtyPrompt=1,2,3,4,5,6 to their
new UIDs

See #11
rm stories.json
Merge branch 'feature/pull-activities-from-empirical' into develop
Merge pull request #136 from wlaurance/master

Pull Activity Information from Empirical-Core API