Tests for :sass_cache_path custom config

First time working with Cucumber, so perhaps not the best way to do things.

* Tests for default setting which stores the .sass_cache directory in Middleman app root.

* Tests for custom setting which stores the .sass_cache directory in /tmp directory.

Please Note!  Unable to test the output of the default .sass_cache location since the directory is stored outside of the app root during testing, but inside app root in "production"

middleman-more/features/sass_cache_path.feature

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+Feature: SASS .sass_cache custom location
+
+  Scenario: Using the default location for .sass_cache folder
+    Given the Server is running at "sass-cache-path-default-app"
+
+    When I go to "/stylesheets/plain.css"
+    Then I should see "color: blue;"
+
+    #  TODO:: 
+    #  Not sure how to test this location, as the directory is stored outside of the app root
+    #  during testing, but inside app root in "production"
+
+    # Then a directory named ".sass_cache" should exist
+
+
+  Scenario: Using a custom location for .sass_cache folder
+    Given the Server is running at "sass-cache-path-custom-app"
+
+    When I go to "/stylesheets/plain.css"
+    Then I should see "html, body, div, span, applet, object, iframe,"
+
+    Then a directory named "/tmp/middleman-more-custom-sass_cache_path" should exist

middleman-more/fixtures/sass-cache-path-custom-app/config.rb

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+
+
+set :sass_cache_path, File.join('/tmp', "#{File.basename(Dir.pwd)}-custom-sass_cache_path")

middleman-more/fixtures/sass-cache-path-custom-app/source/stylesheets/plain.css.sass

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+@import "compass/reset"
+
+red
+  color: blue

middleman-more/fixtures/sass-cache-path-default-app/config.rb

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+
+# Using default setting
+# set :sass_cache_path, File.join(Dir.pwd, '.sass_cache')

middleman-more/fixtures/sass-cache-path-default-app/source/stylesheets/plain.css.sass

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+@import "compass/reset"
+
+red
+  color: blue