releaser: Add release notes to /docs for release of 0.25.1

[ci skip]

Author: bep

docs/content/release-notes/0.25.1-relnotes.md

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+---
+date: 2017-07-10
+title: 0.25.1
+---
+
+	
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+This is a bug-fix release with a couple of important fixes.
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+
+Hugo now has:
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+* 18277+ [stars](https://github.com/gohugoio/hugo/stargazers)
+* 456+ [contributors](https://github.com/gohugoio/hugo/graphs/contributors)
+* 170+ [themes](http://themes.gohugo.io/)
+
+## Fixes
+
+* Fix union when the first slice is empty [dbbc5c48](https://github.com/gohugoio/hugo/commit/dbbc5c4810a04ac06fad7500d88cf5c3bfe0c7fd) [@bep](https://github.com/bep) [#3686](https://github.com/gohugoio/hugo/issues/3686)
+* Navigate to changed on CREATE When working with content from IntelliJ IDE, like WebStorm, every file save is followed by two events: "RENAME" and then "CREATE". [7bcc1ce6](https://github.com/gohugoio/hugo/commit/7bcc1ce659710f2220b400ce3b76e50d2e48b241) [@miltador](https://github.com/miltador) 
+* Final (!) fix for issue with escaped JSON front matter [7f82b41a](https://github.com/gohugoio/hugo/commit/7f82b41a24af0fd04d28fbfebf9254766a3c6e6f) [@bep](https://github.com/bep) [#3682](https://github.com/gohugoio/hugo/issues/3682)
+* Fix issue with escaped JSON front matter [84db6c74](https://github.com/gohugoio/hugo/commit/84db6c74a084d2b52117b999d4ec343cd3389a68) [@bep](https://github.com/bep) [#3682](https://github.com/gohugoio/hugo/issues/3682)
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