Update downsize node module. Small test updates.

issue #4017
- downsize 0.0.5 -> 0.0.8
- downsize is now better at punctuation, update {{content}} and {{excerpt}} tests appropriately.

Conflicts:
	package.json

core/test/unit/server_helpers/content_spec.js

@@ -36,7 +36,7 @@ describe('{{content}} helper', function () {
                 );
 
         should.exist(rendered);
-        rendered.string.should.equal('<p>Hello <strong>World</strong></p>');
+        rendered.string.should.equal('<p>Hello <strong>World!</strong></p>');
     });
 
     it('can truncate html to 0 words', function () {

core/test/unit/server_helpers/excerpt_spec.js

@@ -40,7 +40,7 @@ describe('{{excerpt}} Helper', function () {
 
     it('can truncate html by word', function () {
         var html = '<p>Hello <strong>World! It\'s me!</strong></p>',
-            expected = 'Hello World',
+            expected = 'Hello World!',
             rendered = (
                 helpers.excerpt.call(
                     {html: html},

package.json

@@ -40,7 +40,7 @@
         "colors": "0.6.2",
         "compression": "1.2.0",
         "connect-slashes": "1.2.0",
-        "downsize": "0.0.5",
+        "downsize": "0.0.8",
         "express": "4.10.2",
         "express-hbs": "0.7.11",
         "fs-extra": "0.12.0",