[views] AbstractList: add a pager in the single abstract view
Add an AbstractGroup to conference
[js] AbstractListViewModel: Add support for AbstractGroup
[views] Add groups to AbstractList view
Merge pull request #63 from stoewer/development

Observable models and improved editor

LGTM
Merge pull request #64 from gicmo/abstractViewerUpdate

Add support for Groups in Conference

LGTM
Affiliation: add a position attribute to the model
Author: add a position field to the model

Add a transient field affiliationPositions to the model,
 that can be used by the service class to define the n-to-m
 relationship between authors and affiliations.
serializer: adopt to model changes

AuthorFormat: reads and writes position and affiliations
AffiliationFormat: reads and writes  position
Assets: adopt test data to model changes model

Test data changed for Author and Affiliation
serializer: fix small bug in AuthorFormat.writes
serializer: adopt test
TestAll: add ConferenceCtrlTest