Updated version to 2.0.0 and updated changelog

CHANGELOG.md

-# 2.0.0 (unreleased)
+# 2.0.0 (2015-04-20)
 
 **Fixes**
 - [Issue #1784](https://github.com/grafana/grafana/issues/1784). Data source proxy: Fixed issue with using data source proxy when grafana is behind nginx suburl

package.json

@@ -4,7 +4,7 @@
     "company": "Coding Instinct AB"
   },
   "name": "grafana",
-  "version": "2.0.0-rc1",
+  "version": "2.0.0",
   "repository": {
     "type": "git",
     "url": "http://github.com/torkelo/grafana.git"