Template Engine Consolidation for DocPad

Adds support for a number of template engines
to DocPad, using Consolidate.js.

Convention:

.anything.(atpl|dust|eco|ect|ejs|haml|haml-coffee|handlebars|hogan|jade|jazz|jqtpl|just|liquor|lodash|mustache|qejs|ractive|swig|templayed|toffee|underscore|walrus|whiskers)

Usage

Install the library for the desired template engine:
```
 npm install --save ejs
```
Use the template engine in a file such as src/documents/test.html.ejs:
```
 ---
 title: EJS
 ---
 <p>This is <%= document.title %></p>
```

Configure

It is possible to toggle which supported template engines
are rendered using Consolidate.js,
by editing your DocPad configuration file:

plugins:
    consolidate:
        atpl: true
        dot: true
        dust: true
        eco: true
        ect: true
        ejs: true
        haml: true
        'haml-coffee': true
        handlebars: true
        hogan: true
        jade: true
        jazz: true
        jqtpl: true
        just: true
        liquor: true
        lodash: true
        mote: true
        mustache: true
        nunjucks: true
        qejs: true
        ractive: true
        swig: true
        templayed: true
        toffee: true
        underscore: true
        walrus: true
        whiskers: true