This version includes two patches from Vitaly Ostanin and a new
function.

The new function is `org-crypt-use-before-save-magic'.  When called, it
will add a before-save hook that encrypts all tagged entries.  Example
usage:

(require 'org-crypt)
(org-crypt-use-before-save-magic)

The before-save hook stuff is still experimental.  Please let me know
what you think.