[sugar] Bitfrost compliance for Update.1

[Benjamin M. Schwartz]

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Ivan Krstić wrote:
> Here's how to properly get a temporary file in Python until we  
> provide helpers for it through Sugar:
...
> tmp_root = os.path.join(environ['SUGAR_ACTIVITY_ROOT'], 'tmp')
> tmp = tempfile.TemporaryFile(dir=tmp_root)

According the the tempfile docs [1], the tempfile module respects a $TMPDIR
environment variable.  Sugar should set this variable to the preferred temporary
directory, so that the above boilerplate is unnecessary.

1. http://docs.python.org/lib/module-tempfile
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