Add article structured schema data

[ExcaliburZero]

The article pages do not currently have any schema data. Some schema data should be added to them to make them easier to find through search engines.

See here for more info:

• https://developers.google.com/structured-data/rich-snippets/articles

[ExcaliburZero]

The schema data will need the following:

• Article title
• Image for article (Needed)
• Publish date (ISO 8601 time)
• Description (first paragraph)
• Article body
• Alternate headline (maybe)
• Author

[ExcaliburZero]

The blog post schema should be used, as opposed to the news article schema:

• http://schema.org/BlogPosting

[ExcaliburZero]

I have added article schema data using a few different commits. I will now close this issue.