add docs about npm and bower

docs/change-log.md

@@ -4,9 +4,10 @@
 
 ### News:
 
--	There's now a [community mailing list](mailto:mithriljs@googlegroups.com). There's also [web interface](https://groups.google.com/forum/#!forum/mithriljs)
+-	There's now a [community mailing list](mailto:mithriljs@googlegroups.com). There's also a [web interface](https://groups.google.com/forum/#!forum/mithriljs)
 -	Mithril is now on Travis CI. The build status can be found in the [project homepage](https://github.com/lhorie/mithril.js)
 -	Mithril is now available via the CommonJS and AMD API
+-	Mithril can now [be installed via npm and bower](installation.md)
 
 ### Bug Fixes:
 

docs/installation.md

@@ -38,6 +38,24 @@ Content delivery networks allow the library to be cached across different websit
 
 ---
 
+### NPM
+
+NPM is the default 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 NPM to conveniently keep up-to-date with Mithril versions.
+
+Assuming you have NodeJS installed,  you can download Mithril by typing this:
+
+```
+npm install mithril
+```
+
+Then, to use Mithril, point a script tag to the downloaded file:
+
+```markup
+<script src="/node_modules/mithril/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.