Use consistent 4 space indentation
Fix test names

Test case names from describe and it blocks should combine into a
sentences. cc @jpkorhonen
code style fix
Add Handler model
Add Base.toAttr(...)
Fix RelatedUser and clean up fetchUpdates

RelatedUser model now only references the users table with a foreign key.
I also removed RelatedUser additions from the helpers.insertTestTickets()
method. It's better to add those in the actual tests when they are
needed. Adding too much content in insertTestTickets will make tests
very fragile.

Resource handlers and Ticket#fetchUpdates() now mostly use the Ticket
instance methods instead of using the raw models.

cc @jpkorhonen