Updated docs/bash and docs/emacs

  * docs/bash/profile.org: added one more key to keychain;
  * docs/emacs/emacs.org: added option 'bookmark-default-file';
  * updated (tangled from Org documents) files:
    - emacs.d/bookmark+-us.el;
    - profile.d/05keychain.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>