Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Update select branch to GitLab look and explain why this guide is long so people are not discouraged.

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Simplified the instructions by two steps.

https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Updated instructions to include proper stable. Otherwise they fail due to Rack extensions required below.

This is needed for Ubuntu 12.04, which only provides Git 1.7.9.

Add the -y option to the python apt-get install commands to be consistent with the rest of the Document.

SSH is pronounced as /es es aged/, so we need "an" instead of "a".

Since it is easily could break installations running on the server - hence the person doing the install should be able to make the decision to remove himself.