[Samza Wiki] Update of "Ecosystem" by MartinKleppmann

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The "Ecosystem" page has been changed by MartinKleppmann:
https://wiki.apache.org/samza/Ecosystem?action=diff&rev1=4&rev2=5

  || '''Name''' || '''Description'''||
  || [[https://github.com/linkedin/hello-samza|Hello Samza]] || Hello Samza is a getting-started repository to show how a simple Samza project's code layout looks. ||
  || [[https://github.com/bkirwi/coast/|Coast]] || A DSL that builds DAGs on top of Samza. See [[https://github.com/bkirwi/incubator-samza-hello-samza/tree/hello-coast|hello-coast]] for examples. ||
+ || [[https://github.com/flaxsearch/luwak|Samza-Luwak]] || Uses [[https://github.com/flaxsearch/luwak|Luwak]], a stored-query engine built on Lucene, to implement full-text search on streams. ||
+ || [[https://github.com/ept/newsfeed|Newsfeed]] || Sample implementation of a Twitter-like newsfeed (users post messages to their followers) using Samza. ||