Update README to document METEOR_APP_HOME support in mrun
Update README to document METEOR_APP_HOME support in mrun

practicalmeteor/spacejam,Opstarts/spacejam,serut/spacejam,serut/spacejam,Opstarts/spacejam,practicalmeteor/spacejam,serut/spacejam,Opstarts/spacejam,practicalmeteor/spacejam