Router options to work with the ms-seo package

Adds SEO information to routes for [ms-seo](https://github.com/DerMambo/ms-seo) package. Description works with `Blog.config()` on the client side for the `blogIndex` template. For blog posts, description is either based on an optional `metaDesc` set during blog creation or the excerpt. I have not yet created the corresponding template fields for `metaDesc`.
Meta description

Add optional meta description field.
Meta description

Add optional meta description field.
Wait for data to be ready

Added @ready() condition so data is available.
Don't clear other settings

Added false second parameter so that other settings don't get cleared.
Reverting. Using ShareIt

Reverting changes. Using ShareIt settings instead.
Renamed metaDesc to description

Renamed to work with ShareIt refactoring.
Renamed metaDesc to description

Renamed metaDesc to description to work with refactored ShareIt package.
Merge pull request #137 from eternalwaves/patch-1

Make blog more SEO-friendly