added animation mixin and modified spin mixin to be subset a of that
added animation mixin and modified spin mixin to be subset a of that

socialengineers/groundwork,groundworkcss/groundwork,Scheirle/groundwork,groundworkcss/groundwork,groundworkcss/groundwork,Scheirle/groundwork,Scheirle/groundwork,giveucar/groundwork,mehdroid/groundwork,socialengineers/groundwork,giveucar/groundwork,socialengineers/groundwork,mehdroid/groundwork,giveucar/groundwork,mehdroid/groundwork