Ability to fetch resources with helpers

[claviska]

We need some additional helpers to make templates more useful.

• {{#posts}}
• {{#tags}}
• {{#authors}}

Example usage might look like this:

{{#posts author="bob" query="kittens" count="10" offset="0" sort="newest"}}
    {{#each posts}}
        ...
    {{/each}}
{{/posts}}

[karsasmus]

Added the 3 helpers.

Helper {{#posts}}:

available options:

• author
  The author's slug
• count
  Items per Page
• query
  Searchstring
• sort
  newest or oldest

Returned fields

• id
• slug
• created
• pub_date
• author
• title
• content
• image
• meta_title
• meta_description
• status
• page
• featured
• sticky

If no option is present, the helper returns no data.

Helper {{#tags}}

available options:

• query
  Wildcard to search in slug an name and Description
• count
  Items per page
• sort
  newest or oldest

Returned fields

• id
• created
• slug
• name
• description
• cover
• meta_title
• meta_description

If no option is present, the helper returns no data.

Helper {{#authors}}

available options:

• query
  Wildcard to search the author's slug or name

Returned fields

• slug
• name
• avatar
• post_count

If no option is present, the helper returns all authors.