* Add `.Truncated` bool to each page; will be set true if the
`.Summary` is truncated and it's worth showing a "more" link of some
kind.
* Add `Params` to the site config, defining `.Site.Params` accessible
to each page; this lets the site maintainer associate arbitrary data
with names, on a site-wide basis.
* Provide a `First` function to templates:
* Use-case: `{{range First 5 .Site.Recent}}` or anything else which
is a simple iterable provided by hugolib
* Tests by me for `.Truncated` and `First`
Also @noahcampbell contributed towards this:
* Add UnitTest for `.Site.Params`:
> Digging into this test case a bit more, I'm realizing that we need
> to create a param test case to ensure that for each type we render
> (page, index, homepage, rss, etc.) that the proper fields are
> represented. This will help us refactor without fear in the
> future.
Sample config.yaml:
```yaml
title: "Test site"
params:
Subtitle: "More tests always good"
AuthorName: "John Doe"
SidebarRecentLimit: 5
```
Signed-off-by: Noah Campbell <noahcampbell@gmail.com>
