add documentation for cdn and bower

docs/installation.md

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+## Installation
+
+Mithril is available from a variety of sources:
+
+---
+
+### Direct download
+
+You can [download a zip of the latest version version here](http://lhorie.github.io/mithril/mithril.min.zip).
+
+Links to older versions can be found in the [change log](change-log.html)
+
+In order to use Mithril, extract it from the zip file and point a script tag to the `.js` file:
+
+```markup
+<script src="mithril.min.js"></script>
+```
+
+---
+
+### CDNs (Content Delivery Networks)
+
+You can also find Mithril in [cdnjs](http://cdnjs.com/libraries/mithril/) and [jsdelivr](http://www.jsdelivr.com/#!mithril)
+
+Content delivery networks allow the library to be cached across different websites that use the same version of the framework, and help reduce latency by serving the files from a server that is physically near the user's location.
+
+#### CdnJs
+
+```markup
+<script src="//cdnjs.cloudflare.com/ajax/libs/mithril/$version/mithril.min.js"></script>
+```
+
+#### JsDelivr
+
+```markup
+<script src="//cdn.jsdelivr.net/mithril/$version/mithril.min.js"></script>
+```
+
+---
+
+### Bower
+
+[Bower](http://http://bower.io) is a package manager for [NodeJS](http://nodejs.org/). If you're using NodeJS already or planning on using [Grunt](http://gruntjs.com/) to create a build system, you can use Bower to conveniently keep up-to-date with Mithril versions.
+
+Assuming you have NodeJS installed, you can install bower by typing this in the command line:
+
+```
+npm install -g bower
+```
+
+And you can download Mithril by typing this:
+
+```
+bower install mithril
+```
+
+Then, to use Mithril, point a script tag to the downloaded file:
+
+```markup
+<script src="bower_components/mithril/mithril.min.js"></script>
+```