New (failing) feature describing what it would look like to set some page features through frontmatter.

This tests the ability to set layout, ignore, and diable directory_index. Pertains to issue #194.

middleman-core/features/frontmatter_page_settings.feature

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+Feature: Setting page settings through frontmatter
+  Scenario: Setting layout, ignoring, and disabling directory indexes through frontmatter
+    Given a successfully built app at "frontmatter-settings-app"
+    Then the following files should exist:
+      | build/proxied/index.html |
+      | build/no_index.html |
+    And the file "build/alternate_layout/index.html" should contain "Alternate layout"
+    And the following files should not exist:
+      | build/ignored/index.html |
+      | build/no_index/index.html |

middleman-core/fixtures/frontmatter-settings-app/config.rb

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+activate :directory_indexes
+
+# Proxy ignored.html, which should ignore itself through a frontmatter
+page 'proxied.html', :proxy => 'ignored.html'

middleman-core/fixtures/frontmatter-settings-app/source/alternate.erb

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+Alternate layout!
+
+<%= yield %>

middleman-core/fixtures/frontmatter-settings-app/source/alternate_layout.html.erb

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+---
+layout: alternate
+---
+
+This uses an alternate layout

middleman-core/fixtures/frontmatter-settings-app/source/ignored.html.erb

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+---
+ignored: true
+---
+
+This file ignores itself! But it can still be proxied.

middleman-core/fixtures/frontmatter-settings-app/source/no_index.html.erb

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+---
+directory_index: false
+---
+
+This should not be put in no_index/index.html - it goes to no_index.html