Import recent changes from ruby-build 20160130

plugins/python-build/bin/pyenv-uninstall

@@ -14,6 +14,7 @@ set -e
 
 # Provide pyenv completions
 if [ "$1" = "--complete" ]; then
+  echo --force
   exec pyenv versions --bare
 fi
 
@@ -22,10 +23,6 @@ usage() {
   [ -z "$1" ] || exit "$1"
 }
 
-if [ -z "$PYENV_ROOT" ]; then
-  PYENV_ROOT="${HOME}/.pyenv"
-fi
-
 if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
   usage 0
 fi