Add back grunt-contrib-compress.

Should automate the release process.

[ci skip]

Gruntfile.js

@@ -431,7 +431,27 @@ module.exports = function (grunt) {
           branch: 'gh-pages'
         }
       }
+    },
+
+    compress: {
+      main: {
+        options: {
+          archive: 'bootstrap-<%= pkg.version %>-dist.zip',
+          mode: 'zip',
+          level: 9,
+          pretty: true
+        },
+        files: [
+          {
+            expand: true,
+            cwd: 'dist/',
+            src: ['**'],
+            dest: 'bootstrap-<%= pkg.version %>-dist'
           }
+        ]
+      }
+    }
+
   });