Renamed Async#defer alias to #delay to better mirror the Future/Delay class semantics.

Author: jdantonio

lib/concurrent/async.rb

@@ -271,6 +271,6 @@ def async
     def await
       @__await_delegator__ ||= AwaitDelegator.new(self, Mutex.new)
     end
-    alias_method :defer, :await
+    alias_method :delay, :await
   end
 end

spec/concurrent/async_spec.rb

@@ -239,8 +239,8 @@ def many(*args, &block) nil; end
         val.value.should eq :foo
       end
 
-      it 'is aliased as #defer' do
-        val = subject.defer.echo(5)
+      it 'is aliased as #delay' do
+        val = subject.delay.echo(5)
         val.should be_a Concurrent::IVar
       end