Update installation procedure

[ameesters]

after executing:

git clone https://github.com/joelmoss/strano.git strano

and :

script/bootstrap

You need to copy:

mv config/database.example.yml config/database.yml

Otherwise the installation fails. At least on Ubuntu Server 12.04.1.
Please update the documentation or installation procedure.

[ameesters]

Also, when i got it running, and entered the first project, it seems that Redis is a dependency, it throws a 500 internal server error if its not there.