latest set of videos with annotations added

Video 4.9 references example 4.8, which has data files. Does the api offer the ability to download the files right on the page? 

(Because I wasn't sure, the annotation currently directs people to the github repository to get the files.)

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	<a href="https://github.com/shiffman/The-Nature-of-Code-Examples/tree/master/chp4_systems/NOC_4_08_ParticleSystemSmoke">Get these files on the Github repository</a>.
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