Updated links to GitHub articles,
Updated links to GitHub articles,

as I noticed that the original links were being redirected.

albertodall/Numsense,ploeh/Numsense,wk-j/Numsense,ploeh/Numsense,ErikSchierboom/Numsense,simegeorge/Numsense,simegeorge/Numsense,albertodall/Numsense,ErikSchierboom/Numsense