Add more Ruby versions to Travis suite
Add missing dependencies
Bring back the Travis badge
Add the language:ruby line to .travis.yml
Even more coverage
Key functions

Now you can call the notes by their name like c, cs (c sharp), d
e
Add a missing thread that was making everything offbeat
 Default velocity set to 100
Changes to some printouts
Get rid of Threads and use an EM timer instead
Heartbreaker
Within method introduced

Now you can create events that are played only
within the given ticks.

Example:

    within(32, 44) do
      play(g(3)).every(4)
    end

would only play g(3) when the tick is within 32 - 34 every 4 ticks.
Updated README