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Major change in different version
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Version 0.6.5
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* submit to CRAN on 2011-12-12
* fix example to adapt both released R and devel R
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Version 0.6.3
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* submit to CRAN on 2011-12-11
* fix example errors due to change in methods, setMethod return a 
  generator function
* adding Color constructor


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Version 0.6.2
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* add validObject back to active field
* submit to CRAN on 2011-10-27

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Version 0.5.5
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* remove setProperties
* Adding properties function which is a old signalingFields 
  combining with signalingField
* Adding coerction in properties().


