Release v1.0.0-rc1

- DEPRECATION: The old plain text API used by fb-client <2.0 is now
  deprecated. A warning will be shown for every file uploaded via
  the old API.

- IMPORTANT: Fix an issue with git hooks not working when the installation is
  moved. now creates relative symlinks. If you have moved
  your installation and `git pull` does not display the content of the NEWS file,
  you have to run `scripts/` manually once. Working
  installations are upgraded automatically.

- NEW DEPENDENCY: composer. Currently only used for the test suite, but it will
  likely be used more widely in the future.

- Allow users to delete their own account via a link on the profile page.

- Add code coverage output to test suite and lots of new tests.
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