Wrap to 79 colums. No functionality change.
Merge pull request #682 from nico/pep8

Wrap to 79 colums. No functionality change.
Add a test that shows that there is a single global namespace for rules.
Merge pull request #683 from nico/ruletest

Add a test that shows that there is a single global namespace for rules.
Fix up platform_helper for MSVC, with Python 2.6.8 the arguments have to be in a list, not space separated (unless you set Shell to true)
Merge pull request #688 from ndmitchell/master

Fix up platform_helper for MSVC