Fix Makefile (didn't include weechat.el).

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Add 'Contact' section to README.org.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Remove two compiler warnings by `require'-ing features.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>