add video

packages/events/server/controllers
1. Added query parameter to event controller to find events by user id

packages/videos/server/controllers/videos.js
1. Added query parameter to video controller to find videos by user id

packages/videos/public/controllers/videos.js
1. Added scope variable 'userEvents'
2. Added scope variable 'eventToAddVideo'
3. Added method 'initAdd' to query user events
4. Added method 'setEventToAddVideo'
5. Added property 'event' to video constructor object

packages/videos/public/views/add.html
1. Added event selector