Services for google client auth api load and authorization

- Added svc-gapi.js, a service for providing gapi object and loading the google auth api
- Added svc-auth.js, a service for using the google auth api and resolve authorization so an auth token can be retrieved for use in creating an instance of the google picker
- gapi-mock.js updated to show where "handleClientJSLoad" will be used but commented out for now until the directive is hooked up with the new services
- The "angular" task is updated to be specific on only the directive so the build does not include the new services for now
Merge pull request #26 from stulees/feature/gapi-auth-services

Services for google client auth api load and authorization