Modified default scheduler to choose initial slave at random, instead…

… of first in list

lib/multi_db/scheduler.rb

@@ -12,7 +12,7 @@ def initialize(items, blacklist_timeout = 1.minute)
       @items     = items
       @blacklist = Array.new(@n, Time.at(0))
       @blacklist_timeout = blacklist_timeout
-      self.current_index = 0
+      self.current_index = rand(@n)
     end
 
     def blacklist!(item)