use tput for more compatibility in .rvmrc uses message, fix #2177
Revert "disable awk dotts pipe in SunOS, fix #2173"

This reverts commit b952bf7d20bdc31c0f243981cb754e7fa7b9460c.
fix --trace problem with __rvm_date, update #2174, update #2175
Merge branch 'master' into features/add_support_for_system_synology_gh_ticket_2174