v0.9.0

This one is a doozy! Lots to look through:

• Update table styling in Documentation
• Now showing the plugins_dir in log output if it's present
• With the Posts Reader changes, now you can add a Front Matter Default of
  _posts/drafts having published: false, put a bunch of draft posts in
  _posts/drafts and you're done!
• New -U flag makes it easier to specify generating published: false docs.
• The Posts Reader has been reworked so that files with valid front matter can
  be read in even if there's no YYYY-MM-DD- at the beginning. In addition, static
  files are also supported, which means if you can create a folder (inlinefiles),
  drop a post in along with a bunch of images, and use ![alt](some-image.jpg)
  relative paths, it'll work! Big improvement to Markdown authoring. (You'll need
  to use a permalink in a specific manner though, e.g.
  permalink: /inlinefiles/:title:output_ext)
  If you need a static file not to get copied to the destination, just add an
  _ at the beginning and it'll get ignored.
• Collections no longer allow displaying a full server file path via Liquid.
• {{ page.collection }} now returns a CollectionDrop, not the label of
  the collection. Using the jsonify filter on a document however still returns
  just the label for the collection key.
• Add favicon to website
• Add mobile improvements to website
• Add back working feature tests for basic pagination
• Convert to Ruby 1.9+ symbol: value hash syntax
• Add Swup to website for some slick transitions
• Add "where_query" feature to Paginate. For example. specify where_query: [author, sandy] in the pagination YAML to filter by that front matter key.
• Update the Jamstack page in the docs.