Precedence on ternary expressions

[ichiriac]

Continue precedence implementation on on others nodes - use work already done here #61

<?php 
var_dump($a > 10 ? true : false);

The tree should be like this :

{
  kind: retif, 
  test: {
    kind: bin, type: '>', left: a, right 10
  },
  trueExpr: ...
  falseExpr: ....
}