Latest Ember and Ember Data.
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Test using model accessors.

DS.FixtureSerializer doesn't implement addAttribute, which is needed to
actually serialize models.  This omission seems intentional: it doesn't
make sense to mash together serialization and attribute existence in the
same test.
Use the right BrowserID polyfill in test.
Fix up credentials in scenarios.
More capybara_persona integration.
Gemnasium-informed refresh.

Specifically, this commit updates the gem environment to the latest
suitable versions of:

- foreman
- girl_friday (to be replaced with sucker_punch soon, I guess)
- heroku
- puma
- rspec-rails
- sass-rails
- settingslogic
- strong_parameters
- susy
- travis-lint
Remove timecop, VCR, and Webmock.

The examples that needed these libraries were extracted into Analysand.
Use new strong_parameters specification for arrays.