Merge remote-tracking branch 'origin/pr/50'

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

.travis.yml

@@ -11,5 +11,6 @@ addons:
             - libjudy-dev libvorbis-dev libportaudio-dev libtalloc-dev
 
 script:
+        - make config.h
         - make -j2
         - make -j2 -k check