Line 295: sudo /etc/init.d/gitlab restart
Results in: "Error, unicorn not running!"
This is because unicorn is not yet running for first boot. I suggest changing this to 'start'.

Line 305: sudo apt-get install nginx
Change command to: sudo apt-get -y install nginx
Allowing automated install to simplify and follow pattern of earlier installs.

Change "th" to "the"

'th -> the' typo

Fixes #2334

Closes #2080
Fixes #2264

* build-essential requires make, gcc
* remove libmysql++-dev: the mysql2 gem only requires libmysqlclient-dev
* remove postgresql-server-dev-9.1: the pg gem only requires libpq-dev
* replace python-dev, python-pip with python2.7: the pygments.rb gem only requires python2.7