add manifesto support

pipeline/manifest.py

+import os
+
+from manifesto import Manifest
+
+from pipeline.packager import Packager
+
+
+class PipelineManifest(Manifest):
+    def __init__(self):
+        self.packager = Packager()
+
+    def cache(self):
+        packages, cache = [], []
+        for package_name in self.packager.packages['css']:
+            packages.append(self.packager.package_for('css', package_name))
+        for package_name in self.packager.packages['js']:
+            packages.append(self.packager.package_for('js', package_name))
+        for package in packages:
+            filename_base, filename = os.path.split(package['output'])
+            version = self.packager.versioning.version_from_file(filename_base, filename)
+            output_filename = self.packager.versioning.output_filename(package['output'], version)
+            cache.append(str(self.packager.individual_url(output_filename)))
+        return cache