use recent syntax when we can

pipeline/compilers/__init__.py

@@ -18,9 +18,9 @@ class Compiler(object):
         self.storage = storage
         self.verbose = verbose
 
+    @property
     def compilers(self):
         return [to_class(compiler) for compiler in settings.PIPELINE_COMPILERS]
-    compilers = property(compilers)
 
     def compile(self, paths, force=False):
         for index, input_path in enumerate(paths):

pipeline/compressors/__init__.py

@@ -43,13 +43,13 @@ class Compressor(object):
         self.storage = storage
         self.verbose = verbose
 
+    @property
     def js_compressor(self):
         return to_class(settings.PIPELINE_JS_COMPRESSOR)
-    js_compressor = property(js_compressor)
 
+    @property
     def css_compressor(self):
         return to_class(settings.PIPELINE_CSS_COMPRESSOR)
-    css_compressor = property(css_compressor)
 
     def compress_js(self, paths, templates=None, **kwargs):
         """Concatenate and compress JS files"""