Issue title: improve the README
 Issue body: - [ ] Kill the current README. 
- [ ] Add `examples.md` 
- [ ] Add `perf.md`
- [ ] Add a list of all supported/unsupported areas of usage. 
- [ ] etc(?)
 Comments: 
 Comment 0: [examples](https://github.com/kasperlewau/angular-bind-notifier/wiki/Examples)
 Comment 1: /meh. will come back to this should the need arise.
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