Add a new configuration property to disable sass warnings: disable_warnings

doc-src/content/tutorials/configuration-reference.markdown

@@ -202,6 +202,13 @@ command line will override the corresponding settings in your configuration file
       approach.
     </td>
   </tr>
+  <tr> 
+    <td style="vertical-align:top;"><code>disable_warnings</code> </td> 
+    <td style="vertical-align:top;">Boolean </td> 
+    <td style="vertical-align:top;">
+      Set this to true to silence deprecation warnings.
+    </td> 
+  </tr> 
   <tr>
     <td style="vertical-align:top;"><code>sass_options</code> </td>
     <td style="vertical-align:top;">Hash </td>

lib/compass/commands/update_project.rb

@@ -47,10 +47,10 @@ module Compass
 
       def new_compiler_instance(additional_options = {})
         compiler_opts = Compass.sass_engine_options
-        compiler_opts.merge!(:quiet => options[:quiet],
-                             :force => options[:force],
+        compiler_opts.merge!(:force => options[:force],
                              :sass_files => explicit_sass_files,
                              :dry_run => options[:dry_run])
+        compiler_opts[:quiet] = options[:quiet] if options[:quiet]
         compiler_opts.merge!(additional_options)
         Compass::Compiler.new(working_path,
           Compass.configuration.sass_path,

lib/compass/configuration.rb

@@ -36,7 +36,8 @@ module Compass
       :asset_cache_buster,
       :line_comments,
       :color_output,
-      :preferred_syntax
+      :preferred_syntax,
+      :disable_warnings
     ].flatten
 
   end

lib/compass/configuration/adapters.rb

@@ -46,6 +46,7 @@ module Compass
         engine_opts[:line_comments] = line_comments
         engine_opts[:cache] = cache
         engine_opts[:cache_location] = cache_path
+        engine_opts[:quiet] = disable_warnings if disable_warnings
         engine_opts.merge!(sass_options || {})
       end