Update workshopper-adventure to v4.2.x

[claudiopro]

See issue #16 for more details on workshopper-adventure interface changes.

[claudiopro]

Essentially, this:

workshopper({
    name        : 'learn-sass'
  , title       : 'Learn SASS'
  , exerciseDir : path.join(__dirname, 'exercises')
  , appDir      : __dirname
  , languages   : ['en', 'it', 'pt-br']
})

turns to:

workshopper({
    name        : 'learn-sass'
  , title       : 'Learn SASS'
  , exerciseDir : path.join(__dirname, 'exercises')
  , appDir      : __dirname
  , languages   : ['en', 'it', 'pt-br']
}).execute()

[claudiopro]

Further changes:

• Switch to binary executable under bin/ (see learnyounode)
• Use workshopper-adventure-test to run tests
• Integrate with Travis CI

[martinheidegger]

Also: you can remove the name from the specification object (it will be automatically loaded from the package.json)

[claudiopro]

Cool, will do.

[claudiopro]

Done with #29.