Single entry views

Implements single page views for a content type. If a `template` option is defined and points to a view template that's supported by roots, the extension will compile a single page view for each entry in the content type, passing the entry into the template as the local variable `entry`. Entries also have a `_url` property with the link for that single page view (useful for index/list views). It also supports passing in a `path` function to customize the URL path that roots constructs for each entry.