Use libvips' new lanczos3 kernel as default for image reduce

Deprecate interpolateWith method, now provided as an option

test/bench/random.js

@@ -8,14 +8,12 @@ var Benchmark = require('benchmark');
 var sharp = require('../../index');
 var fixtures = require('../fixtures');
 
+sharp.cache(false);
 sharp.simd(true);
 
 var min = 320;
 var max = 960;
 
-// Nearest equivalent to bilinear
-var magickFilter = 'Triangle';
-
 var randomDimension = function() {
   return Math.ceil(Math.random() * (max - min) + min);
 };
@@ -30,7 +28,7 @@ new Benchmark.Suite('random').add('imagemagick', {
       width: randomDimension(),
       height: randomDimension(),
       format: 'jpg',
-      filter: magickFilter
+      filter: 'Lanczos'
     }, function(err) {
       if (err) {
         throw err;
@@ -44,7 +42,7 @@ new Benchmark.Suite('random').add('imagemagick', {
   fn: function(deferred) {
     gm(fixtures.inputJpg)
       .resize(randomDimension(), randomDimension())
-      .filter(magickFilter)
+      .filter('Lanczos')
       .quality(80)
       .toBuffer(function (err, buffer) {
         if (err) {
@@ -58,19 +56,20 @@ new Benchmark.Suite('random').add('imagemagick', {
 }).add('sharp', {
   defer: true,
   fn: function(deferred) {
-    sharp(fixtures.inputJpg).resize(randomDimension(), randomDimension()).toBuffer(function(err, buffer) {
-      if (err) {
-        throw err;
-      } else {
-        assert.notStrictEqual(null, buffer);
-        deferred.resolve();
-      }
-    });
+    sharp(fixtures.inputJpg)
+      .resize(randomDimension(), randomDimension())
+      .toBuffer(function(err, buffer) {
+        if (err) {
+          throw err;
+        } else {
+          assert.notStrictEqual(null, buffer);
+          deferred.resolve();
+        }
+      });
   }
 }).on('cycle', function(event) {
   console.log(String(event.target));
 }).on('complete', function() {
   var winner = this.filter('fastest').map('name');
   assert.strictEqual('sharp', String(winner), 'sharp was slower than ' + winner);
-  console.dir(sharp.cache());
 }).run();