Hi everyone,
We have released Ansible 1.6.8 to address the issues with shell quoting introduced in the 1.6.7 security release. The same fix was merged into devel earlier in the day, so users experiencing issues with the command/shell modules should upgrade to resolve the issue.
This update is available in PyPi now, as well as on releases.ansible.com in tarball form, and packages for distros will be available as soon as possible.
Thanks!