Tech - Doctors: Update CI AMI with redis & node.js [#57791850]

Pivotal tracker story [#57791850](http://www.pivotaltracker.com/story/show/57791850) in project *Tech - Doctors*:

> This worked for me to install stuff as admin user...
> 
> However I did one thing not the best way for node.
> I tried this first, but I didn't work:
> https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager
> 
> Problem was that sudo apt-get install doesn't work best on CI when you are admin user. sudo su; apt-get install works much better.
> 
> sudo apt-get install python g++ make checkinstall
> mkdir ~/src && cd $_
> wget -N http://nodejs.org/dist/node-latest.tar.gz
> tar xzvf node-latest.tar.gz && cd node-v*
> ./configure
> make
> sudo make install
> sudo npm install -g jasmine-node
> 
> sudo ln -s /usr/local/bin/node /usr/bin/node
> sudo ln -s /usr/local/bin/npm /usr/bin/npm
> sudo ln -s /usr/local/bin/jasmine-node /usr/bin/jasmine-node
> 
> sudo su; apt-get install redis-server