Fixed Makefile bug for stumpwm-contrib

Also updated manual and docstrings for some functions. Applied a patch
from Diogo F. S. Ramos to handle the case when a user aborts while
eval'ing a lisp form from the input prompt.
Merge branch 'master' of https://github.com/stumpwm/stumpwm
Fixing texinfo bugs
Updated raw url for travis build
tweaking.travis.yml
Adding travis install script
Travis tweaks
One more time with feeling
Fixing issues with texinfo compilation
Manual updates