Upgrade to Jasmine 2

Which will lead to use being able to use [Jasq](https://github.com/biril/jasq) and finally have proper mocking capabilities

Main change between 1 and 2 is a change in how async works, e.g. https://github.com/guardian/frontend/compare/jasq-unit-testing#diff-146b91047fed684b8e3c4bb529a9c538R46