Angular 2 forms

• Validation: https://angular.io/docs/ts/latest/cookbook/form-validation.html
• Tutorial: http://blog.ng-book.com/the-ultimate-guide-to-forms-in-angular-2/
• Custom form controls: https://blog.thoughtram.io/angular/2016/07/27/custom-form-controls-in-angular-2.html#understanding-controlvalueaccessor
• http://almerosteyn.com/2016/04/linkup-custom-control-to-ngcontrol-ngmodel
• https://toddmotto.com/building-tesla-range-calculator-angular-2-reactive-forms 
• Template vs model driven (& FRP): http://blog.angular-university.io/introduction-to-angular-2-forms-template-driven-vs-model-driven/