Merge pull request #32 from bejean/master

determineImageSource for width or height = 50
Merge pull request #33 from bejean/master

determineImageSource and list of images in bestMatchElement
make sure ArticleTestExtractor can be used from multiple threads
minor fixes; added contributors file
formatting
make sure images[0]==imageUrl
determineImageSource and list of images in bestMatchElement
Merge branch 'master' of https://github.com/bejean/snacktory