add javaunion in showcase

diff --git a/docs/content/showcase/javaunion.md b/docs/content/showcase/javaunion.md
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+---
+lastmod: 2016-01-20
+date: 2016-01-20T01:28:16+08:00
+description: "Java Union provide java tutorials for java beginer and you can run java program online"
+license: ""
+licenseLink: ""
+sitelink: http://www.javaunion.com/
+tags:
+- tutorials
+- java\r
+- online compile and run \r
+- many examples
+thumbnail: /img/javaunion-tn.png
+title: Java Union
+---
\ No newline at end of file

diff --git a/docs/static/img/javaunion-tn.png b/docs/static/img/javaunion-tn.png
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