scripts/selector in rvm-0.1.2 vs scripts/selector in rvm-0.1.3

@@ -151,12 +151,15 @@
       rvm_url=$rvm_ruby_repo_url
       unset rvm_ruby_configure rvm_ruby_make rvm_ruby_make_install
     ;;
 
     ruby)
-      rvm_ruby_repo_url="${rvm_ruby_repo_url:-"$(__rvm_db "ruby_repo_url")"}"
-      if [[ -z "$rvm_ruby_version" ]] ; then $rvm_scripts_path/log "fail" "Unknown ruby version: $rvm_ruby_version" ; fi
+      if [[ -z "$rvm_ruby_version" ]]  && [[ -z "$rvm_head_flag" ]]; then
+        $rvm_scripts_path/log "fail" "Unknown ruby version: $rvm_ruby_version"
+      else
+        rvm_ruby_repo_url="${rvm_ruby_repo_url:-"$(__rvm_db "ruby_repo_url")"}"
+      fi
     ;;
 
     current)
       ruby_binary="$(which binary 2>/dev/null)"
       if $rvm_scripts_path/match "$ruby_binary" "rvm" ; then
@@ -383,11 +386,9 @@
     elif $rvm_scripts_path/match "$string" "^preview" ; then
       rvm_ruby_patch_level="$string"
     elif $rvm_scripts_path/match "$string" "^rc[0-9]" ; then
       rvm_ruby_patch_level="$string"
     elif $rvm_scripts_path/match "$string" "^[0-9]\.[0-9]" ; then
-      if [[ "1.8" = "$string" ]] ; then string="1.8.6" ; fi
-      if [[ "1.9" = "$string" ]] ; then string="1.9.1" ; fi
       rvm_ruby_version="$string"
       unset rvm_ruby_revision rvm_ruby_tag
     elif $rvm_scripts_path/match "$string" "^p[0-9]" ; then
       rvm_ruby_patch_level="$string"
     elif $rvm_scripts_path/match "$string" "^[0-9][0-9]" ; then