Adds a factory method for environment; given a string.
Adds a factory method for environment; given a string.

OpenWestConference/opencfp,phphants/opencfp,sunshinephp/opencfp,DallasPHP/opencfp,monoku/opencfp,zymsys/opencfp,phphants/opencfp,madisonphp/opencfp,noahd1/opencfp,jugisahunk/200OK_CFP,DevOpsDaysChicago/opencfp,monoku/opencfp,localheinz/opencfp,PHPBenelux/opencfp,MidwestPHP/opencfp_mwphp15,mdwheele/opencfp,MidwestPHP/opencfp_mwphp15,localheinz/opencfp,DallasPHP/opencfp,PHPBenelux/opencfp,DevOpsDaysChicago/opencfp,brynary/opencfp,mdwheele/opencfp,opencfp/opencfp,GrUSP/opencfp,monoku/opencfp,chrispecoraro/opencfp,chrispecoraro/opencfp,phphants/opencfp,localheinz/opencfp,Acidburn0zzz/opencfp,pmeth/opencfp,monoku/opencfp,xavierleune/cfp,noahd1/opencfp,mdwheele/opencfp,zymsys/opencfp,GrUSP/opencfp,PHPBenelux/opencfp,opencfp/opencfp,pmeth/opencfp,zhenqing/opencfp,brynary/opencfp,opencfp/opencfp,phphants/opencfp,OpenWestConference/opencfp,GrUSP/opencfp,zhenqing/opencfp,PHPBenelux/opencfp,PHPmvd/phpday-cfp,madisonphp/opencfp,MidwestPHP/opencfp_mwphp15,jugisahunk/200OK_CFP,mdwheele/opencfp,Acidburn0zzz/opencfp,zhenqing/opencfp,xavierleune/cfp,localheinz/opencfp,OpenWestConference/opencfp,zymsys/opencfp,GrUSP/opencfp,madisonphp/opencfp,jugisahunk/200OK_CFP,MidwestPHP/opencfp_mwphp15,xavierleune/cfp,DallasPHP/opencfp,OpenWestConference/opencfp,Acidburn0zzz/opencfp,sunshinephp/opencfp,PHPmvd/phpday-cfp,noahd1/opencfp,brynary/opencfp,sunshinephp/opencfp,DevOpsDaysChicago/opencfp,pmeth/opencfp