Remove centos from bootstrap.sh
Remove centos from bootstrap.sh

We don't have a Vagrant setup for centos, why would we need a centos
bootstrap?

Also use the rake taks setup:bootstrap to configure the app so we only
have one place where this is done.

rishabhptr/osem,bear454/osem,rishabhptr/osem,SeaGL/osem,differentreality/osem,hennevogel/osem,differentreality/osem,SeaGL/osem,openSUSE/osem,bear454/osem,AndrewKvalheim/osem,rishabhptr/osem,differentreality/osem,bear454/osem,hennevogel/osem,hennevogel/osem,SeaGL/osem,openSUSE/osem,AndrewKvalheim/osem,hennevogel/osem,rishabhptr/osem,differentreality/osem,bear454/osem,openSUSE/osem,AndrewKvalheim/osem