ready to tox.
replace implements declarations to implementer decorator.
add py32,py33 env to tox
ommit dependency to Elixir on py3k.
skip tests with Elixir on py3k.
fix invalid syntax of unicode literal on py3.2
upgrade dependencies versions to support py3
add supporting versions.
Ignore derived.
Add support for testing under tox.
Pin SQLAlchemy for tests to an Elixir-compatible version.

Once Elixir 0.8 is released, we should relax this constraint.
Suppress 'existing session' warnings during tests.
Merge branch 'py3k' of https://github.com/aodag/repoze.who-sqlalchemy
Add the repoze-project-standard CONTRIBUTORS.txt
Add support for PyPy.

Also add changelog note for Py3k support.
sign to Contributors