'Create <manifest>
`entries`: List of (path, mime-type) If mime-type is None it is autodetected'

def create_manifest(self, entries):

    entries = map((lambda x: (x if os.path.isabs(x[0]) else (os.path.abspath(os.path.join(self.base_path, x[0])), x[1]))), entries)
    self.manifest = Manifest.from_paths(entries)
    self.manifest.set_basedir(self.base_path)
