* chore(e2e): WIP to add files needed for app-scripts
* chore(e2e): WIP one e2e test building but with errors
* chore(e2e): move e2e.prod to working with app-scripts
move shared functions into util, add support for debug flag when
running e2e.prod / demos.prod which gets passed to app-scripts
* chore(build): fix app-scripts build for all e2e and demos
* chore(e2e): update ionic-angular import path
* chore(build): update dev paths to work with prod
* chore(e2e): get watch working with e2e prod
* docs(scripts): update README for running e2e and demos
closes#8411closes#10023
BREAKING CHANGES:
- `<button>` becomes `<button ion-button>`
- `<a button>` becomes `<a ion-button>`
- `<button ion-item>` does not get the `ion-button` attribute
- Buttons inside of `<ion-item-options>` do get the `ion-button`
attribute
- Removed the `category` attribute, this should be passed in
`ion-button` instead.
- Button attributes added for icons in buttons: `icon-only`,
`icon-left`, and `icon-right`
closes#7466
