Added learning to the acceptor, fixed some problems in proposer

.gitignore

@@ -0,0 +1 @@
+*.sw?

acceptor.rb

@@ -25,12 +25,13 @@ def request_accept(proposal)
     @propose_mutex.synchronize do
       if proposal.number >= @highest_prepare
         @highest_accepted = proposal
-        return true
+        @supervisor.replicas.each do |replica|
+          replica.learner.learn(proposal.value)
+        end
       end
     end
   end
 
+  private
   Response = Struct.new :highest_accepted, :acceptor
-
-  Proposal = Struct.new :number, :value, :proposer
 end

proposer.rb

@@ -13,6 +13,8 @@ def propose(value)
     @propose_thread = Thread.new do 
       loop do
         @propose_mutex.synchronize do 
+          @n += 1
+
           replicas = @supervisor.replicas
 
           responses = replicas.inject([]) do |memo, replica|
@@ -30,14 +32,12 @@ def propose(value)
             end
           end
 
-          number = @n unless number
+          number and @n = number or number = @n
 
           responses.each do |response|
             response.acceptor.request_accept(Proposal.new(number, value, self))
           end
         end
-
-        @n += 1
       end
     end
   end