Revert "Use sudo for non-windows gem install if SUDOLESS env not set"
Revert "Use sudo for non-windows gem install if SUDOLESS env not set"

This reverts commit 3f315e996b4dba09d7a8e193b34222780d44cb64.

tillsc/dm-core,joevandyk/dm-core,ar-dm/ardm-core,datamapper/dm-core,tpitale/dm-core,alloy/dm-core,engineyard/dm-core