except .. as ..

Add support for Tox (http://tox.testrun.org/) and Travis CI (http://about.travis-ci.org/)

Remove compile directory if it exists before downloading source

Fix annoying behavior where, after a failed compilation, it is needed to run buildout to have the compile-directory removed but have an error message, then run it again to try to compile again.

Add tox.ini for Tox (http://tox.testrun.org). MANIFEST.in also required to make sure all needed docs and tests get into the sdist.

Fixing Recipe.call_script on Windows

A very small ammendment to the --prefix argument of ./configure

If the script was r'C:\someDirectory\someFile.py:someFunction', splitting it would raise an exception
The correct way to spli the filename and the callable would be to rsplit(':', 1)

The call signature for the hook scripts was changed by adding a third
parameter which is a dictionary containing the environment variables copied
from ``os.environ`` and augmented with the environment overrides from the
part configuration.

Existing hook scripts that accept only two arguments continue to work but
reading ``os.environ`` directly will not contain the overridden values.