models.js: convert model properties into observable

Implemented an experimental method on Model that
converts properties into observables.
The module accessors provides the functions that can
create accessors that work similar to  ko.observable.
models.js: toObject() now converts string values to native types.
serializer: fix some small bug in AuthorFormat
AbstractService: apply information provided in affiliationPositions
Application: route and end-point for editor
models.js: sort authors and affiliations
submission.scala.html: always show save button
editor.js: fix small bug with editor initialisation
Merge pull request #83 from stoewer/master

Route to editor and minor fixes

LGTM. Thanks.