Tox-plus

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- fix pip-installation mixups by always unsetting PIP_RESPECT_VIRTUALENV
(thanks Armin Ronacher)
- issue1: Add a toxbootstrap.py script for tox, thanks to Sridhar
Ratnakumar
- added support for working with different and multiple PyPI indexservers.
- new option: -r|--recreate to force recreation of virtualenv
- depend on py>=1.4.0 which does not contain or install the py.test
anymore which is now a separate distribution "pytest".
- show logfile content if there is an error (makes CI output
more readable)

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- work around a virtualenv limitation which crashes if
PYTHONDONTWRITEBYTECODE is set.
- run pip/easy installs from the environment log directory, avoids
naming clashes between env names and dependencies (thanks ronny)
- require a more recent version of py lib
- refactor and refine config detection to work from a single file
and to detect the case where a python installation overwrote
an old one and resulted in a new executable. This invalidates
the existing virtualenvironment now.
- change all internal source to strip trailing whitespaces

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- use virtualenv5 (my own fork of virtualenv3) for now to create python3
environments, fixes a couple of issues and makes tox more likely to
work with Python3 (on non-windows environments)

- add ``sitepackages`` option for testenv sections so that environments
can be created with access to globals (default is not to have access,
i.e. create environments with ``--no-site-packages``.

- addressing issue4: always prepend venv-path to PATH variable when calling subprocesses

- fix issue2: exit with proper non-zero return code if there were
errors or test failures.

- added unittest2 examples contributed by Michael Foord

- only allow 'True' or 'False' for boolean config values
(lowercase / uppercase is irrelevant)

- recreate virtualenv on changed configurations

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- fix OSX related bugs that could cause the caller's environment to get
screwed (sorry). tox was using the same file as virtualenv for tracking
the Python executable dependency and there also was confusion wrt links.
this should be fixed now.

- fix long description, thanks Michael Foord

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- initial release