Standard template helpers

Not quite sure what to do with...

``` handlebars

<h2>getBlock blockname</h2>

{{{getBlock "scripts"}}}
{{{getBlock "styles"}}}
{{{getBlock "meta"}}}
```

It renders to:

``` html
<h2>getBlock blockname</h2>

[object Object]
[object Object]
[object Object]
```

Will we need a toHTML helper?