hook up form controller

- add angular and form controller
- set model on form fields
- make form fields required
- set initial data to empty object (fields are blank)
controller for customer charges

- new controller
- initial values set to 0
- format data as currency
separate app and controllers

- create app in separate file
- read app in controllers
refactor src layout

- move app to app/
- move controllers to app/controllers
- add earnings controller with defaults
- add earnings currency formats
tweak layout

- adjust columns to allow data better
- center alignment for units
add aria-describedby for units
display customer charges #1 #2

update customer charges when form is submitted
Merge pull request #5 from bboyle/submit

submit form data and show charges (Closes #1 #2)