TopGit-0.7

This is mainly a bugfix release that fixes some (of my) annoyances.

A highlight is a new export method (--linearize) that might be more suitable to
create a branch for feeding upstream.

Uwe Kleine-König (10):
      [TOPGIT] limit rev-list in branch_contains to a single rev
      [TOPGIT] allow working with annihilated branches
      [TOPGIT] make tg remote idempotent
      [TOPGIT] make creating a commit from a topgit branch a function
      [TOPGIT] implement linearize export method
      Don't throw away already started base on resumed create.
      Add documentation for tg export --linearize
      Merge branch 'upstream' of git.debian.org:/git/collab-maint/topgit
      Fix typo s/emmail/email/
      bump version number to 0.7