Remove dots from validation errors

Closes #133, Closes 288

lib/paperclip.rb

@@ -302,7 +302,7 @@ module Paperclip
       min     = options[:greater_than] || (options[:in] && options[:in].first) || 0
       max     = options[:less_than]    || (options[:in] && options[:in].last)  || (1.0/0)
       range   = (min..max)
-      message = options[:message] || "file size must be between :min and :max bytes."
+      message = options[:message] || "file size must be between :min and :max bytes"
       message = message.call if message.respond_to?(:call)
       message = message.gsub(/:min/, min.to_s).gsub(/:max/, max.to_s)
 
@@ -328,7 +328,7 @@ module Paperclip
     #   be run is this lambda or method returns true.
     # * +unless+: Same as +if+ but validates if lambda or method returns false.
     def validates_attachment_presence name, options = {}
-      message = options[:message] || "must be set."
+      message = options[:message] || "must be set"
       validates_presence_of :"#{name}_file_name",
                             :message   => message,
                             :if        => options[:if],