0.505   2013-06-22
  * Do required lseek()s in the test-suite since backends no longer
    do undocumented lseek()s on the target/delta file descriptor
  * When trying to load backends, only try loading known backends.
    The old way was a hacky attempt at loading any possible backend
    in the Vcdiff namespace.
  * Doc updates

0.504   2013-06-18
  * Improve test output
  * VCDIFF cross-implementation format compatibility tests
  * which_backend() feature
  * Much improved docs

0.100   2013-06-15
  * Initial release