Clone method now returns it's instance.
Array with waiting callbacks is now reset after they've been used.
Updated README with the lastest changes in the API.
Added ScraperPromise test suite. Updated Dynamic and Static scraper suites.
Added _fire, _setChainParameter, _setPromises and clone test cases to the ScraperPromise suite.
Added checks in DynamicScraper.close, to avoid calling functions over undefined or null.
Added CI support. Added grunt-cli to devDependencies. Added .travis.yml.