Log Message:
Update sysutils/fabric to version 0.9.4

Very minor release.

pkgsrc changes:
- switch MASTER_SITES to pypi.python.org

upstream changes:

* Added documentation for using Fabric as a library.
* Mentioned our Twitter account on the main docs page.
* #290: Added escape kwarg to append to allow control over previously automatic \ 
single-quote escaping.