Add libexec and template-dir to list of included files

These are needed in order for the gem to work properly. We didn't see
this locally because we don't have a convenient way to test it.

Change-Id: I4b4610d95751240a232e90d2d750926262eb5970
Reviewed-on: http://gerrit.causes.com/35637
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>