Delete sections describing install using a package manager

The installation of gems using the package manager is tweaked for Ubuntu/Debian
and 'rake' is not made available on the path after install using gem. The
install from source leads to a more consistent setup.

TESTING.md

@@ -6,18 +6,6 @@ The mustache.js test suite uses the [RSpec](http://rspec.info/) testing
 framework. In order to run the tests you'll need to install [Ruby](http://ruby-lang.org/)
 as well as the `rake`, `rspec` (>=2), and `json` [RubyGems](http://rubygems.org/).
 
-### How to install Ruby, Ruby gems and the required gems with a package manager
-
-Tested on Ubuntu 10.10.
-
-    $ sudo apt-get install ruby1.8-dev
-    $ sudo apt-get install rubygems1.8
-    $ sudo gem install rake rspec
-
-    $ # needed to build native json extension for json gem
-    $ sudo apt-get install build-essential libreadline5-dev
-    $ sudo gem install json
-
 ### How to install Ruby and the required gems from source
 
 Make sure you have the required tools to compile it:
@@ -48,13 +36,6 @@ Install the required gems:
 
 That's it!
 
-### How to install node.js using a package manager
-
-Notice: the version of node.js included in Ubuntu repositories is quite old.
-It is recommended to install node.js from source instead.
-
-    $ sudo apt-get install node
-
 ### How to install node.js from source
 
     $ git clone https://github.com/joyent/node.git