Extend the set of compressible files by some common types.

actionpack/lib/sprockets/static_compiler.rb

@@ -11,7 +11,7 @@ def initialize(env, target, paths, options = {})
       @digest = options.key?(:digest) ? options.delete(:digest) : true
       @manifest = options.key?(:manifest) ? options.delete(:manifest) : true
       @manifest_path = options.delete(:manifest_path) || target
-      @zip_files = options.delete(:zip_files) || /\.(css|js)$/
+      @zip_files = options.delete(:zip_files) || /\.(?:css|html|js|svg|txt|xml)$/
     end
 
     def compile