Syncing hello-world-app for 3.1 release

Conflicts:
	blackberry10/bin/templates/project/www/VERSION
	blackberry10/bin/templates/project/www/res/screen/blackberry/screen-225.png
Adding missing license headers detected by apache rat
CB-4875 updated readme with info on accessing last supported versions of BBOS and Playbook
CB-4876 removal of playbook implementation

Conflicts:
	playbook/README.md
	playbook/bin/templates/project/www/config.xml
updating version and js to 3.1.0-rc1