allow to select group used in cache manifest

docs/configuration.rst

@@ -79,6 +79,16 @@ Group options
   
   Defaults to ``None``.
 
+
+``manifest``
+............
+
+  **Optional**
+
+  Indicate if you want this group to appear in your cache manifest.
+
+  Defaults to ``True``.
+
 ``extra_context``
 .................
 

pipeline/manifest.py

@@ -15,9 +15,13 @@ class PipelineManifest(Manifest):
     def collect_packages(self):
         packages = []
         for package_name in self.packager.packages['css']:
-            packages.append(self.packager.package_for('css', package_name))
+            package = self.packager.package_for('css', package_name)
+            if package['manifest']:
+                packages.append(package)
         for package_name in self.packager.packages['js']:
-            packages.append(self.packager.package_for('js', package_name))
+            package = self.packager.package_for('js', package_name)
+            if package['manifest']:
+                packages.append(package)
         return packages
 
     def cache(self):

pipeline/packager.py

@@ -95,12 +95,15 @@ class Packager(object):
             packages[name]['templates'] = [path for path in paths if path.endswith(settings.PIPELINE_TEMPLATE_EXT)]
             packages[name]['output'] = config[name]['output_filename']
             packages[name]['context'] = {}
+            packages[name]['manifest'] = True
             if 'extra_context' in config[name]:
                 packages[name]['context'] = config[name]['extra_context']
             if 'template_name' in config[name]:
                 packages[name]['template'] = config[name]['template_name']
             if 'variant' in config[name]:
                 packages[name]['variant'] = config[name]['variant']
+            if 'manifest' in config[name]:
+                packages[name]['manifest'] = config[name]['manifest']                
         return packages