Add changelog entry
Merge pull request #624 from pfmoore/changelog-addition

Add changelog entry
Removed Python 2.5 from list of trove classifiers.
Exit early when installing on Python < 2.6.

Fixes issue #631.
Fix expected output to match actual output for setuptools
and pip installation progress.  The progress line has been
one line for a while but the expected output was looking for
two lines.
Merge pull request #635 from shidesthewise/feature/testfix-1

Fixes for validating activation output and setuptools test integration.
Remove duplicate word in installation guide
Merge pull request #642 from nyfarn/patch-1

Remove duplicate word in installation guide
Avoid bleeding "host" Python paths into "guest".

Fixes #625.
Merge pull request #648 from nvie/develop

Avoid bleeding "host" Python paths into "guest"