Initial integration of Google Drive Picker

- Updated bower to include google drive picker component
- Adding gapi-mock.js to provide ability to do mock e2e tests just as its done in Google Drive Picker repo
- Revised english translation.json to include additional localization
- Modified directive HTML template to apply "section" styling/layout and also included google drive picker directive and label
- Updated directive to ensure tooltip and google drive picker are injected as dependencies and also wrapping in self executing anonymous function
- Updated e2e test HTML file to include appropriate imports for Google Drive Picker integration and also correct formatting