update: Added Gemfile

* Starting with a few packages

Signed-off-by: mr.Shu <mr@shu.io>
update: First working version

* First version of our proposed heuristics.
* Finds the best matching article (biggest amount of text in a div) and
  then produces an XPath for it.

Signed-off-by: mr.Shu <mr@shu.io>