Merge tag 'v0.9.0' into dgit/sid

Version v0.9.0

Changes
=======

* `setup`: Ask the user for another note if the current is taken

  It is not possible to retrieve the OAuth token anymore using the GitHub API,
  so instead of doing that, we ask the user to create a new token if the
  default one is already used.

  https://github.com/sociomantic/git-hub/pull/133

* `pull rebase`: Add `--delete-branch` option

  When this option is used, the branch used to make the pull request from will
  be deleted after rebasing the pull request.

  https://github.com/sociomantic/git-hub/pull/129

* `man` page improvements

  Describe the missing global options and add a `FILES` section mentioning
  files used to keep, for example, the messages typed by the user.

  https://github.com/sociomantic/git-hub/pull/131
  https://github.com/sociomantic/git-hub/pull/126

* Fix `--pause` resuming

  https://github.com/sociomantic/git-hub/pull/132

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