Rakuten buys e-reader Kobo for $315 million

  TORONTO (Reuters) - Canadian-based e-reading service Kobo Inc will be acquired by Japan's Rakuten Inc for $315 million, the companies said in a release on Friday.              Rakuten, an Internet services and e-commerce company, intends to acquire all issued and outstanding shares of Kobo for cash.               Kobo was founded by Toronto-based Indigo Books & Music Inc and spun off in...