add exercise pig latin
Merge pull request #81 from exercism/pig-latin

add exercise pig latin
clock: additional test cases
Merge pull request #82 from exercism/clock

clock: additional test cases
Rename `Sing()` to `Song()` in beer-song

The names `Verse`, `Verses`, and `Sing` were not at the same level of
abstraction. `Song` fixes this.