Use uuid.uuid4() to generate a slug for Event
event.id -> event.slug
Also index slug in search
Merge branch 'master' into issue-66

* master:
  Updated lucene version to 4.10
eventgroup.id -> eventgroup.slug
Fixed link to editing a talk
Merge branch 'master' into issue-66

* master:
  Include speakers in search results list #73

Conflicts:
	talks/templates/search/search.html
Generate slug from uuid for Person
Also expose person slug in the API view
Merge branch 'master' into issue-66

* master:
  email -> email_address
  add 'var'; remove 'todo'; handle groupID=null;
  Edit and Show views for Person Person list in contributors area Updated dev data to include email addresses for all Persons
  Fixed modal form to create event group
  Set valid locations for dev_data.
  Form now saves department as id only
  Event form's department field updated when a new event group is selected. Not yet saved correctly.
  Added api call to retrieve event group information by id
  Add migration for department->department_organiser
  Updated event group (non-editing) view to show added fields. Fixed missing group type in contributors homepage
  Organiser now saved correctly from EventGroup form
  organiZer->organiSer Department organiser for event group now an oxpoints ID, pickable by typeahead
  #72 new fields in EventGroup, basic form update

Conflicts:
	talks/api/serializers.py
Added slug for Person
improve search form
Search form: include the query as value not placeholder
Responsive search template, display search results first
Merge branch 'master' into issue-66

* master:
  Responsive search template, display search results first
  Search form: include the query as value not placeholder
  improve search form

Conflicts:
	talks/templates/search/search.html
Merge pull request #114 from ox-it/issue-66

ID -> slug
Added 404 and 500 templates
Fixed search results template when there was no speakers
Merge branch 'master' into issue-91