docs(): updated version to 2.5.0

docs/sources/guides/whats-new-in-v2-5.md

+---
+page_title: What's New in Grafana v2.5
+page_description: What's new in Grafana v2.5
+page_keywords: grafana, new, changes, features, documentation
+---
+
+# What's new in Grafana v2.5
+
+

package.json

@@ -4,7 +4,7 @@
     "company": "Coding Instinct AB"
   },
   "name": "grafana",
-  "version": "2.5.0-pre2",
+  "version": "2.5.0",
   "repository": {
     "type": "git",
     "url": "http://github.com/torkelo/grafana.git"