Render data from `info.json` in spec

[robhrt7]

If title or description fields are provided in info,json, auto-render them on page.

[robhrt7]

This can be done directly in EJS template file.

Example in core/views/doc.ejs:

<div class="source_main source_col-main" role="main">
  <h1><%= info.title %></h1>
  <%- content %>
</div>

I've also added this snippet in default SourceJS init repo sourcejs/init@79e41f0

@mistermark, you were interested in this feature.