Merge pull request #486 from wmathurin/unstable

Fix for switch to user not bring up switching screen + Misc changes (most already in unstable23)
Merge pull request #487 from wmathurin/unstable23

Merge from unstable (fix for switchToUser)
Merge pull request #488 from wmathurin/unstable23

Latest samples
Merge pull request #489 from wmathurin/unstable

Switching to a new user would not cause the hybrid activity to be restarted
Merge pull request #490 from wmathurin/unstable23

Merge from unstable (fixes for user switching bugs)
Merge pull request #491 from wmathurin/unstable23

Return of ContactExplorer, SmartStoreExplorer and HybridFileExplorer
Add intent for user switch action
Move register and unregister calls to onCreate() and onDestroy()
Move UserSwitchReceiver to the SDK
Move peekRestClient() call to onResume()
Remove redundant intent broadcast
Fix for login problems
Fix for crash
Make user switch refresh methods protected
Add support for multiple users in NativeSqlAggregator
Merge pull request #492 from bhariharan/unstable

Add intent for user switch action
Merge branch 'unstable' into unstable23
Merge pull request #493 from bhariharan/unstable23

Merge branch 'unstable' into unstable23
Adding intent for access token refresh event
Merge pull request #494 from bhariharan/unstable

Adding intent for access token refresh event