attr
    live.attr(el, attributeName, compute)
  
  Keep an attribute live to a can-compute.
var div = document.createElement('div');
var compute = canCompute("foo bar");
live.attr(div,"class", compute);
Parameters
- el {HTMLElement}:The element whos attribute will be kept live. 
- attributeName {String}:The attribute name. 
- compute {can-compute}:The compute. 
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