bin: get --daemon working on OSX.

bin/bcoin

@@ -6,7 +6,7 @@ cmd='node'
 
 if ! type perl > /dev/null 2>& 1; then
   if uname | grep -i 'darwin' > /dev/null; then
-    echo 'Bcoin requires perl to start.' >& 2
+    echo 'Bcoin requires perl to start on OSX.' >& 2
     exit 1
   fi
   rl=1
@@ -50,9 +50,13 @@ for arg in "$@"; do
 done
 
 if test $daemon -eq 1; then
+  # And yet again, OSX doesn't support something.
   if ! type setsid > /dev/null 2>& 1; then
-    echo 'Bcoin requires setsid to start as a daemon.' >& 2
-    exit 1
+    (
+      "${dir}/${cmd}" "$@" > /dev/null 2>& 1 &
+      echo "$!"
+    )
+    exit 0
   fi
   (
     setsid "${dir}/${cmd}" "$@" > /dev/null 2>& 1 &