GWAR-ticle and Photos by: Steven Principato   Union Square, NYC -- At a venue familiar for sweaty raves (people still do that?), tonight there would be no ecstasy-fueled, bass-bumping, fist-pumping orgies of discotheque debauchery at the historic Union Square venue. Instead, we would be forced to endure the skull crushing metal assault and hyper-projectile spew