add Integer traitlet #996

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Commits on Nov 13, 2011
  1. add Integer traitlet

    minrk committed Nov 1, 2011
    Most int traits are now Integers
    
    Integer differs from Long only in that small `long`s are cast to `int`, rather than
    all `int`s being cast to `long`:
    
        Integer(4L) => 4
        Long(4) => 4L
    
    closes gh-942