[Nitro] Nitro gem seems not to install properly on ubuntu

[Matthew Welland]

I started the email message below but soon realized that gems is broken on 
ubuntu/debian. Manual install of all the dependancies is not working (yet).

Consider this an FYI and a request for advice on an easy way to get ruby + 
gems + nitro and dependancies working on ubuntu.

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Nitro is somehow not quite setup properly.

matt at xena:~/tmp/examples-0.28.0/hello$ sudo gem install nitro
Attempting local installation of 'nitro'
Local gem file not found: nitro*.gem
Attempting remote installation of 'nitro'
Successfully installed nitro-0.28.0
matt at xena:~/tmp/examples-0.28.0/hello$ ruby run.rb 
run.rb:1:in `require': no such file to load -- nitro (LoadError)
        from run.rb:1
matt at xena:~/tmp/examples-0.28.0/hello$