Insert conventional headers.
Replace cl.el with cl-lib.el
Introduce helm-source-ad-params-* variables.
Remove LICENSE
Introduce the helm-ad-action-function variable.

It defaults insert.
Improve comments.
Version bump to 0.0.1.
Revert "Introduce the helm-ad-action-function variable."

This reverts commit 57f526995d435a8c4dbfb558ccfb9105be3218c9.
Introduce the helm-ad-action-function variable.