[f] cpan modules non-root install

[Dan MacNeil]

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   affects mvhub
   tag refactor
   done

cpan modules are currently installed by root , globally.

This has disadvantages:

 1) root is requied to install them
 2) It is not possible to test if we have all
     dependencies documented

We should create:

 /var/www/mvhub/$USER/cpan

to put cpan modules in.

we should update $PERL5LIB

We should create:

  app-mvhub/project-tools/bin/mv_cpan
to:
 1) run cpan and put stuff in our cpan dir
 2) update our bundle of dependencies (dummy cpan module)

See:
 http://www.perlmonks.org/?node_id=361887
 http://wiki.developers.facebook.com/index.php/Perlstart_cpan

creating a test to remove cpan modules, re-install them & re-run other
tests would be a good idea. also

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