Update install scripts to work on latest gitolite & ubuntu#18

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jedahan wants to merge 6 commits intogitlabhq:masterfrom

Commits on Oct 28, 2012

replace gl-setup with gitolite command
Jonathan Dahan
committed
install postgres for 20121001
Jonathan Dahan
committed

Commits on Oct 31, 2012

require sudo for install scripts; update to latest documentation
Jonathan Dahan
committed
require sudo for script execution
Jonathan Dahan
committed
point to local for now
Jonathan Dahan
committed
noninteractive mysql install
Jonathan Dahan
committed