use .sass-cache everywhere

middleman-core/lib/middleman-core/renderers/sass.rb

@@ -14,10 +14,10 @@ module Middleman
           # Default sass options
           app.set :sass, {}
 
-          # Location of SASS .sass_cache directory.
+          # Location of SASS .sass-cache directory.
           # @return [String]
-          #   set :sass_cache_path, "/tmp/middleman-app-name/sass_cache"
-          app.set(:sass_cache_path) { File.join(app.root_path, '.sass_cache') } # runtime compile of path
+          #   set :sass_cache_path, "/tmp/middleman-app-name/sass-cache"
+          app.set(:sass_cache_path) { File.join(app.root_path, '.sass-cache') } # runtime compile of path
 
           app.before_configuration do
             template_extensions :scss => :css,

middleman-more/features/sass_cache_path.feature

@@ -1,6 +1,6 @@
-Feature: SASS .sass_cache custom location
+Feature: SASS .sass-cache custom location
 
-  Scenario: Using the default location for .sass_cache folder
+  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"
@@ -10,10 +10,10 @@ Feature: SASS .sass_cache custom location
     #  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
+    # Then a directory named ".sass-cache" should exist
 
 
-  Scenario: Using a custom location for .sass_cache folder
+  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"

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

@@ -1,3 +1,3 @@
 
 # Using default setting
-# set :sass_cache_path, File.join(Dir.pwd, '.sass_cache')
+# set :sass_cache_path, File.join(Dir.pwd, '.sass-cache')