CoS form validation and tooltip

One of the things user can do on this screen is allocate different percentages to each class of service. It must all add up to 100%, and the distribution will also affect the monthly price.

Using protopie and its new variables and input field feature, I was able to create this interactive prototype to show:
- Relevant tooltip appearing when a field is in focus
- How the percentage counter updates based on changes in each input changes
- What happens when the total is more than 100%
- When the price gets updated

Check it out here: https://goo.gl/t68Soa