setup Vagrant for tests
add test for virtualenv
release 1.0.0rc1
1.0.0rc2git
declare `PYENV_ROOT` in command line to reuse it for other users.
add `:pyenv_setup_global_version` to skip settings global version
add :pyenv_configure_options to pass `CONFIGURE_OPTS` to python-build
support invoking commands via rbenv.exec using sudo
skip installation if the requested version has been installed
release 1.0.0rc2

* fix using pyenv via sudo
* try building python only if it has not been installed
* skip setting global version if requested
1.0.0rc3git
fix in test case. use /dev/null as known_hosts to discard SSH host key.
style issue
try setting global even if it has not newly installed.
release 1.0.0
Merge branch 'release-1.0.0'