in the snippet like this:
gulp.task \"coffee\", ->
gulp.src(\"src/server/**/*.coffee\")
.pipe(coffee {bare: true}).on(\"error\",gutil.log)
I was having this exact same problem and the solution turned out to be pretty easy for me. Basically change your code to the following and it should work. NOTE: the return before gulp.src made all the difference for me.
gulp.task "coffee", ->
return gulp.src("src/server/**/*.coffee")
.pipe(coffee {bare: true}).on("error",gutil.log)
.pipe(gulp.dest "bin")
gulp.task "clean",->
return gulp.src("bin", {read:false})
.pipe clean
force:true
gulp.task 'develop',['clean','coffee'], ->
console.log "run something else"