fixes install target, adds travis badge, invokes make test

edit README.md
 * adds travis status badge

edit Makefile
 * fixes install target to depend on youtube-dl.fish
 * fixes README.md target to invoke youtube_dl compliant with python-2.6

edit .travis.yml
 * adds pre-install verbosity
 * pandoc installation
 * make, make test, sudo make install,
The README goes into other places. I'm not sure why we would want to include the travis badge. Can you elaborate? Since I've started working on it, youtube-dl has never ever been closed to commits.