`scroll-watch` parameters change

- `lower` -> `from`
- `upper` -> `to`
`sw-on` -> `sw-broadcast`
Fix/Refine `sw-broadcast`. New parameters: `$rootScope`, `$emit`.
New example: sw-broadcast
Merge branch 'sw-broadcast'
Bump version 0.2.0
Merge branch 'release/v0.2.0'