Rename contexts to roles
Setup Ical conversion roles
Switch to GH version of json_spec
Update to json_spec 1.1.2
Add role_playing
Move Events Ical Formatting to a context
Handle Ical Formatting through EventsRepresenter
Add Ical format for grape
Init context with the collection as the state

This will be more consistent with future contexts
Fix & test events to ical conversion
Merge branch 'ical'