Update jquery
Split off common forms code
Add reference to EventSeries in Event
Populate series property in event
Use _.extend instead of _.merge

Using _.merge will only add ObjectIds to the series Array (deep merge).
Use _.extend instead to achieve event.series = newEvent.series style updates.
See also DaftMonk/generator-angular-fullstack#310
Submit only ObjectIds on populated Resource properties
Offer to select event series
Merge branch 'feature/event_has_series' into develop