feat(boot): expose Jasmine 2.x methods

- expose public Jasmine API directly
- avoid proxying the API through own methods
- use native `execute` which takes care of
  focused tests by itself
- add 'use strict' and JSLint/Hint
chore(tests): upgrade to Jasmine 2.1
Merge pull request #69 from olegskl/feat-boot-jasmine-api-no-proxy

feat(boot): jasmine api no proxy