Draft: Resolve "Analytics dashboard: list of users by reputation gain"

Closes #29

app/helpers/analytics_dashboard_helper.rb

@@ -66,4 +66,21 @@ module AnalyticsDashboardHelper
       .count(:user_id)
       .max(10) { |a, b| a[1] <=> b[1] }
   end
+
+  def recent_active_users
+    recent_votes = Vote.where(created_at: 2.year.ago..Time.now)
+    user_ids = recent_votes.map(&:user_id).uniq
+
+    reps = {}
+
+    user_ids.each do |user_id|
+      user = User.find(user_id)
+      user_votes = recent_votes.where(user_id: user_id)
+      user_rep = Vote.total_rep_change(user_votes) + SiteSetting['NewUserInitialRep']
+      reps[user.username] = user_rep
+    end
+
+    reps.sort_by { |_, v| v }.reverse
+    reps.first(10)
+  end
 end