[S] new logic for post-receive hook
[S] new logic for post-receive hook

the actual post-receive hook on the server will now `eval`
our script, so it always gets the new version.
Here's the new post-receive hook on the server for reference:
```#!/bin/sh
while read oldobj newobj refname; do
        eval "$(git show master:server/config/post-receive)"
        # Allow for master to be re-pushed at any time
        rm -f refs/heads/master
done```

pineman/abra,pineman/abra,pineman/abra