Import recent changes from ruby-build 20140225
Import recent changes from ruby-build 20140225

xshwy/pyenv,lepture/pyenv,rowhit/pyenv,BanzaiMan/pyenv,sebhahn/pyenv,takluyver/pyenv,zmwangx/pyenv,dongguangming/pyenv,xshwy/pyenv,sebhahn/pyenv,lozybean/pyenv,hlecuanda/pyenv,syndbg/goenv,lozybean/pyenv,genome-vendor/pyenv,obimod/pyenv,dnsd/pyenv,cehoffman/pyenv,blueyed/pyenv,dnsd/pyenv,kevinburke/pyenv,yyuu/pyenv,genome-vendor/pyenv,recruit-mtl/pyenv,pyenv/pyenv,chenfengyuan/pyenv,VShangxiao/pyenv,pyenv/pyenv,takluyver/pyenv,chenfengyuan/pyenv,cehoffman/pyenv,syndbg/goenv,yeonsh/pyenv,habinmusic/pyenv,yeonsh/pyenv,VShangxiao/pyenv,rowhit/pyenv,pyenv/pyenv,dongguangming/pyenv,sebhahn/pyenv,habinmusic/pyenv,syndbg/goenv,fly19890211/pyenv,yyuu/pyenv,BanzaiMan/pyenv,UCASREN/pyenv,obimod/pyenv,kevinburke/pyenv,syndbg/goenv,lepture/pyenv,zmwangx/pyenv,recruit-mtl/pyenv,UCASREN/pyenv,fly19890211/pyenv,hlecuanda/pyenv