* include more ancestors in candidate scoring
* fix medium-3 testcase
The original source file contained two copies of the document, which
was causing incorrect results
* remove unnecessary nested elements
* fix removal of empty elements
* add option to regenerate all testcases
* update tests
* fix quanta testcase
* fix creating testcase from network
* fix early exit in testcase generation
* format HTML before comparing while testing
* upgrade js-beautify
* don't merge outer readability div
