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,
Yes, Travis-CI is running Ubuntu 12.04 (in the case of youtube-dl), which is indeed a distribution related to Debian. While pandoc requires explicit installation, python, thankfully, does not since it is already present in the default Travis Ubuntu image.