'Removes :param:`item` from the manifest.'

def remove(self, item):

    if (item in self.ids):
        item = self.ids[item]
    del self.ids[item.id]
    if (item.href in self.hrefs):
        del self.hrefs[item.href]
    self.items.remove(item)
    if (item in self.oeb.spine):
        self.oeb.spine.remove(item)
