[model+serializer+test] Author: convert to PositionedModel
[model+serializer+test] Affiliation: convert to PositionedModel
[test] Topics: add position in Assets
[model+serializer+test] Figure: convert to PositionedModel
[model+serializer+test] Reference: convert to PositionedModel

This is part of issue #106
[less] Add drag-handle icon classes
[views] submission: make references reorderable by dragging
[all] References: +text,+link,-{author, title, year}

This is the second and last part of issue #106.
[views, js/model] References.format(), Add links for text+doi
[views] AbstractList: actually format References
Merge pull request #134 from gicmo/sortableEntities

Make Author, Affiliation, Figure and Reference a PosistionedModel; Simplify Reference

Very nice