Switching travis to use flask backend.

Related to 18F/afsmallbiz#91.
Added script command to travis script.
Added explicit grunt to travis scriptw.
Added explicit grunt install call.
Added explicit npm install call.
Adding explicit grunt build and resolution for angular-schema-form
Adding a toggle for angular-schema-form.
Adding bower resolutions for angular and angular-schema-form.
Merge pull request #15 from DavidEBest/issue91_python_flask_port

Switching travis to use flask backend.