Multi-blog site

By default, a PieCrust website has one unique blog or news feed, but you can have several separate ones if you need it. It works like this:

Define your blog names in the site configuration:
```
site:
    blogs: [ pro, family ]
```
Move your posts inside sub-directories named after each blog. So instead of having all your posts inside the _content/posts folder, you would have some posts under _content/posts/pro, and other posts under _content/posts/family, depending on which blog they belong to.

Note that the post URLs will always be prefixed with the blog name, so choose it accordingly. For example, you would get URLs like this:
```
http://domain.com/family/2011/07/12/my-kid-just-turned-2/
http://domain.com/pro/2011/07/12/troubleshooting-xzy-errors-with-abc/
```
If you have _tag.html or _category.html special pages, move them to sub-directories named after each blog. So you would end up with _content/pages/family/_tag.html and _content/pages/pro/_tag.html.
If you want to configure each blog differently, specify configuration settings in a section named after the blog in the site configuration. For example, here’s how you keep the same date format between your 2 blogs, but with a different number of posts per page:
```
site:
    blogs: [ pro, family ]
    date_format: 'F j, Y'

pro:
    posts_per_page: 20

family:
    posts_per_page: 6
```
Settings that you can configure either at the site or blog level are: post_url, tag_url, category_url, posts_per_page and date_format. The first 3 settings (URL formats) will be automatically prefixed with the blog name, as mentioned in the previous point. Note that the posts_fs setting can’t be overriden — it would be confusing to have posts organized differently between blogs.
If you create a new page that lists posts (e.g. the main page, or the RSS feed page), you can specify what blog to take posts from with the blog setting in the page’s configuration header:
```
blog: family
```
By default, all pages take posts from the first declared blog.