[IMP] README.md: badges for docs, help, nightly

README.md

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+[![Build Status](http://runbot.odoo.com/runbot/badge/flat/1/8.0.svg)](http://runbot.odoo.com/runbot)
+[![Tech Doc](http://img.shields.io/badge/8.0-docs-8f8f8f.svg?style=flat)](http://www.odoo.com/documentation/8.0) 
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 Odoo
 ----
@@ -13,7 +16,6 @@ a full-featured <a href="https://www.odoo.com">Open Source ERP</a> when you inst
 
 Getting started with Odoo
 -------------------------
-
 For a standard installation please follow the <a href="https://www.odoo.com/documentation/8.0/setup/install.html">Setup instructions</a>
 from the documentation.