Deletion of Rigor Sardonicous

Comment: passes #C1 on the star rated Allmusic reviews alone; http://www.allmusic.com/cg/amg.dll?p=amg&sql=11:jzfixq8sldfe~T2. As for the claim to being one of the earliest doom metal bands, if it cant be sourced, remove it as original research
Stance: keep
Cited policy: Wikipedia:Notability (WP:MUSIC)