anchor.diff:  part of github.client;
   
  +/**
  + * A Contributor's Statistics for a Repository
  + */
   class ContributorStatistics {
     final GitHub github;
   
  +  /**
  +   * The Author
  +   */
     User author;
  +  
  +  /**
  +   * Total Commits
  +   */
     int total;
  +  
  +  /**
  +   * Weekly Statistics
  +   */
     List<ContributorWeekStatistics> weeks;
   
     ContributorStatistics(this.github);
  
positive.code:   }
  }
  
  class WeeklyCommitCounts {
    final GitHub github;
    List<int> all;
    List<int> owner;
  
    WeeklyCommitCounts(this.github);
  
negative.code: class ContributorWeekStatistics {
    final GitHub github;
  
    /**
     * Beginning of the Week
     */
    DateTime start;
    
    /**
     * Number of Additions
     */
    int additions;
    
    /**
     * Number of Deletions
     */
    int deletions;
    
    /**
     * Number of Commits
     */
    int commits;
  
    ContributorWeekStatistics(this.github);
  