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Merge pull request #196 from Stebalien/expose-production_url

Expose production_url
allow `production_url` to be accessed as `urls.production`
Merge pull request #206 from waffleio/master

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Add feature tests for ignoring a collection folder.
Add 'static' resource for compiling static assets.

Usage:

\#config.yml
recipes:
   use: 'static'
Plugins should run when using the client.
Add failing tests for bug #197 permalink ignores .html
Refactor the url-slug generation process.

- Better encapsulate logic into single-purpose class.
- Abstract out url (string) formatters into Ruhoh::StringFormat for better API exposure. This allows plugins  to more easily re-implement custom formatters. Partially addresses #186.
- Fix for custom-defined extensions in permalinks not persisting. Closes #197.
Refactor CLI pages creation logic.
Add title into base scaffold if defined. Closes #131
implement @davedoesdev fix for description not working in RSS.

Closes #182
Refactor page.summary into single-purpose service.
Add feature test for page-inline summary_lines configuration.

Closes #64
Fix previewer choking on url_endpoints['production']

The production endpoint is specific to the view only so it should be added there.
Also map urls.production_url to urls.production. Closes #134
bump v2.3
Release 2.3
Make dates formattable

This commit makes the date format customizable via the `date_format`
option. While this option is site-wide, specific dates can be formated
with `{{#date.strftime}}format_string{{/date.strftime}}`.

closes ruhoh/ruhoh.rb#69
Fix logging error.
Add test cases for date formatting.