[Cassandra Wiki] Update of "DataModel" by JonathanEllis

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The "DataModel" page has been changed by JonathanEllis:
https://wiki.apache.org/cassandra/DataModel?action=diff&rev1=43&rev2=44

Comment:
r/m old stuff, add PK post

  The first component of a table's primary key is the partition key; within a partition, rows are clustered by the remaining columns of the PK.  Other columns may be indexed independent of the PK.
  
  This allows pervasive denormalization to "pre-build" resultsets at update time, rather than doing expensive joins across the cluster.
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- A blog post by committer [[https://twitter.com/tylhobbs|Tyler Hobbs]] that gives [[http://www.datastax.com/dev/blog/basic-rules-of-cassandra-data-modeling|Basic Rules of Cassandra Data Modeling]].
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- !DataStax has a free self-paced online course [[https://academy.datastax.com/courses/ds220-data-modeling?dxt=blogposting|DS220: Data Modeling with Apache Cassandra]].
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- A blog post by [[https://twitter.com/syllogistic|Sebastian Estevez]] describing a web based tool he created to help visualize data models (pre-3.0) as well as gives a tailored cassandra-stress configuration file to test the model. [[http://www.datastax.com/dev/blog/data-modeler|Using the Cassandra Data Modeler to Stress and Size Cassandra Instances]]
  
  [[https://twitter.com/patrickmcfadin|Patrick McFadin's]] data modeling series:
  
@@ -20, +14 @@

   1. The World's Next Top Data Model: [[http://www.youtube.com/watch?v=HdJlsOZVGwM|Video]], [[http://www.slideshare.net/patrickmcfadin/the-worlds-next-top-data-model|Slides]]
   1. Apache Cassandra 2.0: Data Model on Fire: [[http://www.youtube.com/watch?v=oUEKMcTsbfU|Video]], [[http://www.slideshare.net/planetcassandra/c-summit-eu-2013-apache-cassandra-20-data-model-on-fire|Slides]]
   1. Real Data Models of Silicon Valley: [[https://www.youtube.com/watch?v=XGrJLZcRhAw&list=PLqcm6qE9lgKJkxYZUOIykswDndrOItnn2&index=16|Video]], [[http://www.slideshare.net/patrickmcfadin/real-data-models-of-silicon-valley|Slides]]
+  1. [[http://www.planetcassandra.org/blog/the-most-important-thing-to-know-in-cassandra-data-modeling-the-primary-key/|The most important thing to know in Cassandra data modeling: The primary key]]. (Blog post)
  
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