Add Bugsense error sending on Android.
Fix json property name.
Fix Metadata cloning.
Set AutoNotify default to true.
Make exception handlers virtual.
Add a method to provide additional data to user info.
Make Andorid BugsnagClient feature complete.
Add InstallId to SettingStore.
Integrate Bugsnag with Android app.
Add BugsnagUserManager.

BugsnagUserManager keeps the BugsnagClient in sync with the currently
authenticated user.