Allow custom templates

I've been having a few issues running iseed seeders in certain positions.

Firstly, I run a script to make sure seeding can't happen on production db (this could end badly). However I seed seems to not support this due to the finishing `}` tag.

I.e. 
`	public function run()
	{
		Eloquent::unguard();

		if(App::environment() == "local")
		{
			throw new \Exception('Only run this from production');
		}
`