Angular template for directive

- Moved template into angular folder and removed html folder
- Wrote full template with binding values and filter for translations
- Ensuring Tooltip component from widget-settings-ui-components is being used within template
- Adding tooltip component import to Angular test HTML and also providing commented out imports for dev testing
Node package and bower updates

- Bower now includes dependency on widget-settings-ui-components
- Switched gulp-html2string node module for gulp-htmljs in package.json since only Angular is being built for this component
- gulpfile updated with html2js and appropriate task, requiring gulp-sass, and slight re-organization to build/test tasks