Fix conversation tests

Author: dmytroyarmak

spec/models/conversation_spec.rb

@@ -2,7 +2,7 @@
 
 describe Conversation do
   describe 'associations' do
-  	it { should have_many(:messages).order('created_at DESC') }
+  	it { should have_many(:messages).order('created_at ASC') }
   	it { should have_many(:subscriptions) }
   	it { should have_many(:participants).class_name("User") }
   	it { should have_many(:participants).through(:subscriptions) }