update README.rst

- new dbsake example after some of the command / documentation
  changes (encode -> encode-tablename, etc.)
- updated documentation links to point to develop documentation
  for now.
fix frmdump option links

- remove :option: link for --raw-types and replace with --type-codes
minor documentation cleanups
fix long line in distutils_ext
report database.table when index rewriting is skipped

- section is now passed directly to the defer api which
  performs the necessary manipulations, rather than
  embedding logic in the transformation stage.
ensure ./tmp/ is created even if ./data/ already exists

- previously prepare_sandbox_paths() would stop after
  the first existing path (typically ./data) and not
  create ./tmp.  Now this preparation stage is only
  aborted on an unexpected error or if --force was
  not specified.
  Resolves issue #65
add compression api

- This currently supports a context manager that will start
  a decompression command and yield its stdout.  This is intended
  to support read from compressed data using a command with
  an interface similar to /bin/gzip [-d]
make sandbox --data-source use standard compression utilities

- previously this would only use "transaparent" decompression
  using tarfile - which ultimately used the stdlib gzip/bzip2
  interfaces, which were causing performance issues.  Now
  pigz/gzip, pbzip2/bzip2, lzop, and xz/lzma compression
  commands are supported.
  Resolves issue #64