[fix] Use process.execPath for spawning.
[fix] Use process.execPath for spawning.

ContinuumIO/forever,kethle/forever,nguyen-tien-mulodo/forever,foreverjs/forever,saisai/forever,yyx990803/forever,vcarrera/forever,Jonekee/forever,JJediny/forever,arnabsinha4u/demo-documentation,foreverjs/forever,kethle/forever,saisai/forever,jotham/forever,jotham/forever,arnabsinha4u/demo-documentation,ryan321/forever,ryan321/forever,nguyen-tien-mulodo/forever,rbramwell/forever,yyx990803/forever,vcarrera/forever,ContinuumIO/forever,Jonekee/forever,jqk6/forever,rbramwell/forever,JJediny/forever,jqk6/forever