Add support for multiple instances of the same command

This patch adds support for starting and supervising multiple
services (run, task, or service) using an extra #ID number.

service #1 [2345] /sbin/httpd -f -h /http -p 80   -- Web server
service #2 [2345] /sbin/httpd -f -h /http -p 8080 -- Old web server

Also included in this patch is a fix for endless respawn of faulty
services.  For instance, a buggy daemon that crashes repeatedly will now
be stopped after 10 respawns.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -206,6 +206,16 @@ the `/path/to/cmd` should be executed with.  Simply prefix the path with
 
     run [2345] @joe:users /usr/bin/logger "Hello world"
 
+For multiple instances of the same command, e.g. a DHCP client or
+multiple web servers, add `#ID` somewhere between the `run`, `task`,
+`service` keyword and the command, like this:
+
+    service #1 [2345] /sbin/httpd -f -h /http -p 80   -- Web server
+    service #2 [2345] /sbin/httpd -f -h /http -p 8080 -- Old web server
+
+Without the `#ID` to the service the latter will overwrite the former
+and only the old web server would be started and supervised.
+
 
 /etc/finit.d
 ------------