Add FakeDate object
Add specs for mock date
add acceptance tests for mock clock with date
Merge branch 'mock-date' of https://github.com/jalopez/jasmine into jalopez-mock-date
Support browsers that don't supply a `Date.now()`

- install the mockDate by calling `mockDate` on `clock` instead of
  passing an argument to `clock.install()`

[Finishes #66606132] Closes #361