Change template to use special delimiters.

The attached code closes issue #8. It changes the template delimiters you'd use when defining a template in order to circumvent Grunt's default processing:

```javascript
/* Gruntfile */
neuter: {
  options: {
    template:'function(){ {%= src %} }'
  },
  ...
}

/* Neuter.js task */
console.log(this.options.template);
// output: "function(){ {%= src %} }"

console.log(grunt.template.process(options.template, templateData));
// output: function(){ /*my code here*/ }
```