update years
Merge pull request #465 from RusAlex/530_update_years

update copyright years
Remove the dot notation syntax for getters; it just doesn't belong in the scope of BBR.
API change: make `fetchRelated` return a single promise. Ref #467
Add `fetchRelated` change to change log
Rename `key` to `attr` in some places, to correspond with Backbone's distinction.
Implement `getAsync` as a separate function on RelationalModel
Simplify `getAsync`; using Deferred.then with its `doneFilter` works great here.
Minor test rewrites so we can more easily test lazy loading with the Zoo/Animal models
Replace `fetchRelated` by `getAsync`. Update tests and docs as well. Ref #467
Merge branch 'performance' of github.com:opallabs/Backbone-relational into origin/performance
Bring back the ability for relations to be passed as a function