feat(questDirectives): Add question types

[eladzlot]

• [x] text.
• [x] text (number).
• [x] Radio Buttons/likert scale.
• [x] Select One.
• [x] Multiple choice.
• [x] Slider (support descreet points, and vertical sliders).
• [ ] Multiple choice for long lists (https://github.com/angular-ui/ui-select).

[eladzlot]

We want to support some complex directives here. It makes little sense writing them from scratch. On the other hand, adding in libraries slows us down and adds excess requests...

https://github.com/andreev-artem/angular_experiments/tree/master/ui-multicombo

• require: none
• provides: mutliselect + combo

http://formstamp.github.io/

• requires: jquery, bootstrap.js
• provides: dropdown (single, multi)

https://github.com/angular-ui/ui-select2

• jquery, select2
• powerful dropdown

http://angular-ui.github.io/ui-slider/demo/demo.html

• requires: jquery, jquery-ui
• provides: slider

http://danielcrisp.github.io/angular-rangeslider/demo/

• jquery
• slider

http://darul75.github.io/ng-slider/

• jquery, ngSanitize
• slider