Fix usage of environment variables for Heroku credentials.
Fix usage of environment variables for Heroku credentials.

emanuel/engine,timsly/engine,k-yamada/engine,travis-repos/engine,thirus/engine,StartupWeekend/engine,dreimannzelt/locomotive-engine,local-ch/locomotivecms-engine,merqlove/engine,bewculture/engine,scarl3tt/engine,furkanayhan/engine,timsly/engine,dickeyxxx/girltalk,merqlove/engine,gdsn13/locridevie,k-yamada/engine,ipmobiletech/locomotivecms-engine,benhutton/engine_bak,benhutton/engine_bak,gdsn13/lococodevie,bewculture/engine,boie0025/engine-clone,chepri/engine,slavajacobson/engine,ipmobiletech/locomotivecms-engine,slavajacobson/engine,furkanayhan/engine,LaunchPadLab/engine,Sharagoz/engine,joshsoftware/puneruby,slavajacobson/engine,gdsn13/locridevie,ipmobiletech/locomotivecms-engine,local-ch/locomotivecms-engine,masm/engine,gdsn13/lococodevie,LaunchPadLab/engine,gdsn13/locridevie,ipmobiletech/locomotivecms-engine,merqlove/engine,bewculture/engine,boie0025/engine,timsly/engine,boie0025/engine-clone,masm/engine,jhe/Earthena-Website,thirus/engine,merqlove/engine,Gnuside/contrib-locomotivecms-engine,boie0025/engine,scarl3tt/engine,thirus/engine,jhe/Earthena-Website,dreimannzelt/locomotive-engine,Gnuside/contrib-locomotivecms-engine,StartupWeekend/engine,k-yamada/engine,boie0025/engine-clone,gdsn13/locridevie,local-ch/locomotivecms-engine,bewculture/engine,Coren/engine,Coren/engine,chepri/engine,gdsn13/lococodevie,LaunchPadLab/engine,masm/engine,Coren/engine,Vinagility/engine_old,boie0025/engine-clone,furkanayhan/engine,scarl3tt/engine,dickeyxxx/girltalk,boie0025/engine,benhutton/engine_bak,slavajacobson/engine,travis-repos/engine,jhe/Earthena-Website,timsly/engine,Sharagoz/engine,StartupWeekend/engine,LaunchPadLab/engine,Coren/engine,joshsoftware/puneruby,gdsn13/lococodevie,emanuel/engine,dreimannzelt/locomotive-engine,boie0025/engine,joshsoftware/puneruby,scarl3tt/engine,local-ch/locomotivecms-engine,chepri/engine,masm/engine,Sharagoz/engine,StartupWeekend/engine,thirus/engine,chepri/engine,Gnuside/contrib-locomotivecms-engine,Vinagility/engine_old,joshsoftware/puneruby,travis-repos/engine,k-yamada/engine,emanuel/engine,Vinagility/engine_old,dreimannzelt/locomotive-engine,jhe/Earthena-Website,bewculture/engine,gdsn13/locridevie,furkanayhan/engine,travis-repos/engine