Added release notes

releases/2.9.0.md

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+## Version 2.9.0
+
+### Periodic 2.9.0, one step closer. 
+* fixed assets and primary assets in admin
+* cleaned up reader theme, iOS fixes
+* updated default content in DBseed
+* added core controller support for preview themes
+* added support for tags and categories for assets
+* added support for environment specific themes
+* added custom view engine support
+* added new admin
+
+### Notes
+* Periodic
+ * Added support for pre start up scripts (new relic)
+ * Added custom session secret( add to config.json)
+ * Added support for custom node modules (add to config.json)
+* Extension: Core Controller (2.0.2)
+ * preview theme support
+* Extension: Preview Theme (1.0.0)
+ * environment view html customization support
+* Extension: Google Analytics (1.0.0)
+ * environment view html customization support
+* Extension: Install (2.9.0)
+ * environment specific configuration installation
+* Extension: Admin (2.9.5)
+ * new theme settings, new content editor, support for html augmentation in views