change ctx.length and ctx.type to always delegate to response object [breaking change]

lib/context.js

@@ -149,11 +149,11 @@ delegate(proto, 'response')
   .method('set')
   .access('status')
   .access('body')
+  .access('length')
+  .access('type')
   .getter('headerSent')
   .setter('lastModified')
-  .setter('length')
-  .setter('etag')
-  .setter('type');
+  .setter('etag');
 
 /**
  * Request delegation.
@@ -175,13 +175,11 @@ delegate(proto, 'request')
   .access('path')
   .access('host')
   .access('url')
-  .getter('length')
   .getter('subdomains')
   .getter('protocol')
   .getter('header')
   .getter('secure')
   .getter('stale')
   .getter('fresh')
-  .getter('type')
   .getter('ips')
   .getter('ip');

test/response/type.js

@@ -7,6 +7,7 @@ describe('ctx.type=', function(){
     it('should set the Content-Type', function(){
       var ctx = context();
       ctx.type = 'text/plain';
+      ctx.type.should.equal('text/plain');
       ctx.response.header['content-type'].should.equal('text/plain');
     })
   })
@@ -15,6 +16,7 @@ describe('ctx.type=', function(){
     it('should lookup the mime', function(){
       var ctx = context();
       ctx.type = 'json';
+      ctx.type.should.equal('application/json');
       ctx.response.header['content-type'].should.equal('application/json');
     })
   })
@@ -24,6 +26,7 @@ describe('ctx.type', function(){
   describe('with no Content-Type', function(){
     it('should return null', function(){
       var ctx = context();
+      // TODO: this is lame
       assert(null == ctx.type);
     })
   })
@@ -31,8 +34,8 @@ describe('ctx.type', function(){
   describe('with a Content-Type', function(){
     it('should return the mime', function(){
       var ctx = context();
-      ctx.req.headers['content-type'] = 'text/html; charset=utf8';
-      ctx.type.should.equal('text/html');
+      ctx.type = 'json';
+      ctx.type.should.equal('application/json');
     })
   })
 })