apply sho's patch: default values may be lambdas

lib/couchrest/core/model.rb

@@ -510,6 +510,11 @@ module CouchRest
       if self.class.default
         self.class.default.each do |k,v|
           self[k] = v unless self.key?(k.to_s)
+          if v.class == Proc
+            self[k.to_s] = v.call
+          else
+            self[k.to_s] = Marshal.load(Marshal.dump(v))
+          end
         end
       end
     end

lib/couchrest/monkeypatches.rb

@@ -8,7 +8,7 @@ class Time
 
   def to_json(options = nil)
     u = self.utc
-    %("#{u.strftime("%Y/%m/%d %H:%M:%S +0000")}")
+    %("#{u.strftime("%Y/%m/%d %H:%M:%S.#{u.usec} +0000")}")
   end
 
   # Decodes the JSON time format to a UTC time.