Update bower instructions to install latest version

Installation via github will pull the latest building blocks. The
website also shows the latest version of Building-Blocks. Therefore the
bower instructions should also install the latest version.

Author: Valentin Tsatskin

README.md

@@ -23,7 +23,7 @@ Install
 
 1. You can git clone the code from github `https://github.com/buildingfirefoxos/Building-Blocks.git`
 
-2. Or if you have bower installed ([http://bower.io/](http://bower.io/)), run command: `$ bower install building-blocks`
+2. Or if you have bower installed ([http://bower.io/](http://bower.io/)), run command: `$ bower install building-blocks#gh-pages`
 
 
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