Merge pull request #8 from dominis/master

Added hostlist argument
Handling cases where herd.py is symlinked to another location

For instance, when in /usr/bin as per proper package install.
Merge pull request #9 from sebito91/patch-1

Handling cases where herd.py is symlinked to another location
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Handling cases where herd.py is symlinked to another location