ansible 1.8.1

This a rather urgent bug fix release, but there was a [packaging issue](https://groups.google.com/d/msg/ansible-project/L-XhSe7dP8E/InT7p0X_ZyAJ) that resulted with a bloated tarball (12M instead of less than 1M).

I propose to keep this pull request open until I bring some updates (e.g. direct jump to hypothetical 1.8.2, for instance)