Merge branch 'hotfix/1.22.18'
pristine only gems with extensions or executables, closes #2258
speed up selecting gems to pristine by selecting them in ruby, update #2258
use rubygems 1.8 for ruby 1.9.1, fix #2262
early initialize command_to_run in __rvm_try_sudo to make it work properly wwith root user, fix #2255
Updating verification for question mark in url
Merge pull request #2263 from oldNoakes/master

Updating verification for question mark in url
do not export __rvm_date and silence when it is missing in PS4, fix #2234
1.22.19
Merge branch 'master' into hotfix/1.22.19
Merge branch 'hotfix/1.22.19' into stable