GET attendees new parameter

[sidthekidder]

The json response returned for the attendees route should have a 'track' key for each 'attendee' in the array. The track parameter may be like Studio, Developer etc

This change is needed in /attendeees as well as /favorite-attendees, it currently does not include the 'track' key.

http://tcoapi.apiary-mock.com/tcos/tco14/attendees
http://tcoapi.apiary-mock.com/tcos/tco14/favorite-attendees

The concerned code is at
line 1, https://github.com/cloudspokes/tco-api/blob/master/actions/attendees.js
line 7, https://github.com/cloudspokes/tco-api/blob/master/initializers/attendees.js

line 26, https://github.com/cloudspokes/tco-api/blob/master/actions/favorites.js
line 63, https://github.com/cloudspokes/tco-api/blob/master/initializers/favorites.js