Change functions parseContentWithCandidates and stripGarbage

Based on the recommendations:
http://stackoverflow.com/questions/5662404/how-can-i-select-an-element-with-multiple-classes-with-xpath

I changed the functions parseContentWithCandidates and stripGarbage. And therefore it was necessary to change the list of elements.

New features and elements have been tested on a number of sites to which I subscribe. There is a question on the item `article`, tested on a number of sites, there are problems. And most likely it should be removed.

Complete the analysis is not strong enough. Last night was engaged in building a list for miniflux. And now I can do only after the new year.

Also added rules for a number of sites that work with your functions. And is a duplicate of my new functions.