Update README.md

fix typo
Merge pull request #11 from jdreesen/patch-1

Update README.md
Use custom events for ViewObservables
Move operators under the rx.android package
Remove useless generics, prodive some helper methods
Update gitignore file
Add fromSharedPreferencesChanges Observable

this useful to listen for SharedPreferences changes
remove isUnsubscribed call befor item emittion
Fix a typo in the docs

And a bit of formatting
Merge pull request #29 from egor-n/0.x

Fix a typo in the docs of AndroidSubscriptions.unsubscribeInUiThread()
Merge pull request #22 from mironov-nsk/view-observables

Make ViewObservables consistent with each other
Merge pull request #25 from Yarikx/shared-preferences-observable

Add fromSharedPreferencesChanges Observable