add to docs including how to use the slides and rename methods.
BREAKING CHANGE:
The Slides component has been refactored. Many methods and events were
renamed.
The following events have been renamed:
- `slideChangeStart` has been renamed `willChange`
- `change` has been renamed `didChange`
The following methods have been renamed:
`next()` has been renamed to `slideNext()`
`prev()` has been renamed to `slidePrev()`
`getIndex()` has been renamed to `getActiveIndex()`
`getNumSlides()` has been renamed to `length()`
`isAtEnd()` has been renamed to `isEnd()`
`isAtBeginning()` has been renamed to `isBeginning()`
`getSliderWidget()` has been renamed to `getSlider()`
The following method was added: `slideTo()`
All methods have been documented in the API docs:
http://ionicframework.com/docs/v2/api/components/slides/Slides/
references #5508, references driftyco/ionic-site#458
