Mutate data less in EY::Server.run_on_roles.
Mutate data less in EY::Server.run_on_roles.

This stops the commands from growing with every server that they run
on. Interestingly, since Thor uses a last-in-wins strategy for parsing
the command line, the hugely bloated commands still worked as
expected.

[#107]

engineyard/engineyard-serverside,engineyard/engineyard-serverside,engineyard/engineyard-serverside,engineyard/engineyard-serverside