Update travis.yml, add Makefile

Now we'll run the tests like that:

    $ make test
install other reqs for travis
travis fails with 'cannot find module should'
on mode guess and check
can't figure out why should isn't imported
try to link should
try --save-dev and link
remove link underscore
remove link mocha
readd underscore
test
test
Merge pull request #17 from Fandekasp/feature/fix_tests

Feature/fix tests