feat(scenario): added ability to set decorators

Extended application.navigateTo to support registering decorators during
the NG_DEFER_BOOTSTRAP!
Added application.addDecorators and an addDecorators DSL to allow decorators to be registered during tests
Merge pull request #11 from candersony/scenario_decorators

feat(scenario): added ability to set decorators
Simplifying integration with CucumberJS
* removing describeStart as it's no longer necessary
* exposing root describe on runner api instead of featureStart, scenarioStart, stepStart
Merge pull request #12 from maciejblinkbox/angularTag_v1.1.5-alpha

Simplifying integration with CucumberJS