Merge pull request #5 from kedder/master

Exclude system site-packages from tests' sys.path
Preparing release 1.2.7
Back to development: 1.2.8
Add missing dependency on z3c.recipe.scripts
Merge pull request #6 from ggozad/z3c.scripts

Add missing dependency on z3c.recipe.scripts
Preparing release 1.2.8
Back to development: 1.2.9
README.txt -> README.rst, CHANGES.txt -> CHANGES.rst
mention code repository in README.rst
Support for custom init code in virtualenv

Otherwise, initialization section and environment section are
completely missing from generated test script, when buildout is run
under virtualenv.

See buildout/buildout#20 for more info.

Fixes collective/collective.xmltestreport#8.