Fixes accept? to match wildcards in HTTP_ACCEPT.

lib/sinatra/base.rb

@@ -28,7 +28,7 @@ module Sinatra
     end
 
     def accept?(type)
-      preferred_type.include?(type)
+      preferred_type(type).include?(type)
     end
 
     def preferred_type(*types)

test/request_test.rb

@@ -63,6 +63,11 @@ class RequestTest < Test::Unit::TestCase
     end
   end
 
+  it "accepts types when wildcards are requested" do
+    request = Sinatra::Request.new('HTTP_ACCEPT' => 'image/*')
+    assert request.accept?('image/jpeg')
+  end
+
   it "properly decodes MIME type parameters" do
     request = Sinatra::Request.new(
       'HTTP_ACCEPT' => 'image/jpeg;unquoted=0.25;quoted="0.25";chartest="\";,\x"'