challenge8b - added spec for monad and echo.
Merge pull request #2 from alexwei/master

challenge8b - added spec for monad and echo.
clean ups, upped dependencies, made sure tests don't error during setup, defined a Monoid skeleton for Writer
Merge pull request #2 from jedws/master

clean ups, upped dependencies, made sure tests don't error during setup, defined a Monoid skeleton for Writer