Depend on jasmine-core npm instead of vendoring

- jasmine-core now exports the files necessary to load jasmine in an
  html page.

- This allows users to choose their jasmine version by just updating
  their jasmine-core dependency.
jasmine-core 2.0.4 is the version that finally works correctly
Merge pull request #163 from slackersoft/jasmine-core

Depend on jasmine-core npm instead of vendoring jasmine