Update for current org version.

The `org-drawers` variable and the `org-in-commented-line` function are no
longer present in org. Use `org-at-comment-p` and `org-in-drawer-p` instead.

Signed-off-by: Dato Simó <dato@net.com.org.es>
Fixed missing close parenthesis
Require cl at compile time

I didn't realize before, because I require 'cl in my .emacs file, but you
use incf which comes from cl.
Merge branch 'master' of https://github.com/dato/org-wc

Conflicts:
	org-wc.el