Update ZF1 makefile

Altered export-zpk target to remove documentation, demos, puppet, and tests
directories, (in both root and extras) as they are not needed for the deployment
package.
ZF1 zpk creation improvements

- Fixed a number of paths/variables so that the Makefile will work correctly
Created GitHub webhook script

- Accepts ping/push/release events
- Queues them to gearman "zfdeploy" queue, with the sha1 or tag name as
  the workload.
Wrote zfdeploy worker

- Takes incoming version, checks it out from git, builds new phar file,
  copies it into web tree, and updates manifest.
Made worker script executable