WIP: The Dashboard only shows papers that the user is "My Paper" or "Collabor...

...ator" on.

[#80325566]

This fixes the bug!

RW + DT

Questions:

- should we have used `find` to query instead of assuming the litePapers are already in the store?
the `indexOf` here isn't very idiomatic.  I'd use `roles.contains('My Paper').  You guys should check out the [Enumerable docs](http://emberjs.com/api/classes/Ember.Enumerable.html#method_contains)