Create prank.rb

Pageranking articles within the dataset of available articles about an algorithm.
Ex. For the case of Bubble sort results are in order - 

Sorting-algorithms tops with 3 prank 

 _id: ObjectId("52e3dc1aa32bf73fc5000002"),
      link: "http://en.wikipedia.org/wiki/Bubble_sort",
      prank: 2,
      title: "Bubble sort - Wikipedia, the free encyclopedia"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000003"),
      link: "http://www.cprogramming.com/tutorial/computersciencetheory/sorting1.html",
      prank: 0,
      title: "Bubble Sort and Modified Bubble Sort - Cprogramming.com"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000004"),
      link: "http://rosettacode.org/wiki/Sorting_algorithms/Bubble_sort",
      prank: 0,
      title: "Sorting algorithms/Bubble sort - Rosetta Code"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000005"),
      link: "http://www.youtube.com/watch?v=BMZ6MF_l3vw",
      prank: 0,
      title: "Bubble Sort! - YouTube"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000006"),
      link: "http://www.youtube.com/watch?v=lyZQPjUT5B4",
      prank: 1,
      title: "Bubble-sort with Hungarian (&quot;Csángó&quot;) folk dance - YouTube"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000007"),
      link: "http://xlinux.nist.gov/dads/HTML/bubblesort.html",
      prank: 1,
      title: "bubble sort"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000008"),
      link: "http://www.algolist.net/Algorithms/Sorting/Bubble_sort",
      prank: 1,
      title: "BUBBLE SORT (Java, C++) | Algorithms and Data Structures"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc5000009"),
      link: "http://www.programmingsimplified.com/c/source-code/c-program-bubble-sort",
      prank: 0,
      title: "C program for bubble sort | Programming Simplified"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc500000a"),
      link: "http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/Sorting/bubbleSort.htm",
      prank: 0,
      title: "Bubble Sort - Personal.kent.edu"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc500000b"),
      link: "http://en.wikiversity.org/wiki/Bubble_sort",
      prank: 0,
      title: "Bubble sort - Wikiversity"
    },
    {
      _id: ObjectId("52e3dc1aa32bf73fc500000c"),
      link: "http://www.sorting-algorithms.com/bubble-sort",
      prank: 3,
      title: "Bubble Sort - Sorting Algorithm Animations"
    }