Repoze.tm2

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- Added ``repoze.tm.default_commit_veto`` commit veto hook. This commit veto
hook aborts for 4XX and 5XX response codes, or if there's a header named
``X-Tm-Abort`` in the headerlist and allows a commit otherwise.

- Documented commit veto hook.

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- Don't commit after aborting if the transaction was doomed or if the
commit veto aborted.

- Don't use "real" transaction module in tests.

- 100% test coverage.

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- RESTify CHANGES, move docs in README.txt into Sphinx.

- Remove ``setup.cfg`` (all dependencies available via PyPI).

- Synchronization point with ``repoze.tm`` (0.9).

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Allow ``commit_veto`` hook to be specified within Paste config, ala::

[filter:tm]
use = repoze.tm:make_tm
commit_veto = some.package:myfunction

``myfunction`` should take three args: environ, status, headers and
should return True if the txn should be aborted, False if it should be
committed.

Initial PyPI release.

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- Provide "commit_veto" hook point (contributed by Alberto Valverde).

- Point easy_install at http://dist.repoze.org/tm2/dev/simple via setup.cfg.

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- Fork point: we've created repoze.tm2, which is repoze.tm that has a
dependency only on the 'transaction' package instead of all of ZODB.

- Better documentation for non-Zope usage in README.txt.