Updated karma config to export a function

http://karma-runner.github.io/0.10/config/configuration-file.html

Was receiving errors when trying to run karma tests. Had to update the
config file to export a function and use the jasmine framework.
Updated unit test to check for initialization of new initial zoom level
Merge pull request #103 from grantlucas/grantlucas_karma_config_update

Update Karma Config