complete with helm is now possible
lisp/org.el (org-icompleting-read): require `helm-mode' because
`helm-completing-read-default-1' is not autoloaded.
lisp/org.el: Fix helm completing
Use `helm-comp-read instead' of `helm-completing-read-default'
lisp/org.el: `org-completion-handler' can be a function now
Merge branch 'test'

Conflicts:
	lisp/org.el