Add API for setting AWS push token. Still need to finalize token name and add docs.
Fix name of aws_sns token.
Fix message polling code to use interrupts when the message center goes into foreground. This is to ensure that the tighter foreground interval is adopted immediately when the message center goes into the foreground.
Prevent a push notification from showing the message center if the message center is already running. Clear pending message center push notifications when the message center stops or exits.
Javadoc the AWS SNS stuff. Change some variable names around.
Update README for AWS SNS support, last minute change to method name.
Merge branch 'branch_1.4.1' into aws_push
Bump to 1.4.2. Update README, CHANGELOG, and APIChanges.
Still on 1.4.2. Update AWS SNS method name. Update API doc.
Update release date to today on CHANGELOG.
Fix typos and copypasta in README.
Use correct name for AWS push method in README.
Merge master to interaction_surveys branch.