Made watch=true the default

It's now left out of the entrypoint arguments, so can be supplied as
an argument when running it.

README.md

@@ -42,4 +42,9 @@ $ dig @$dns_ip +short shell1.weave
 ```
 
 By default, the server will also watch docker events and remove
-entries for any containers that die.
+entries for any containers that die. You can tell it not to by adding
+`--watch=false` to the container args:
+
+```bash
+$ weave run 10.0.0.2/16 --name=weavedns -v /var/run/docker.sock:/var/run/docker.sock zettio/weavedns --watch=false
+```

docker/Dockerfile

@@ -2,4 +2,4 @@ FROM scratch
 # EXPOSE 53/udp
 WORKDIR /home/weave
 ADD ./weavedns /home/weave/
-ENTRYPOINT ["/home/weave/weavedns", "-wait", "5", "-iface", "ethwe", "--watch", "--api", "unix:///var/run/docker.sock"]
+ENTRYPOINT ["/home/weave/weavedns", "-wait", "5", "-iface", "ethwe"]

main.go

@@ -24,7 +24,7 @@ func main() {
 	flag.IntVar(&wait, "wait", 0, "number of seconds to wait for interface to be created and come up (defaults to 0)")
 	flag.IntVar(&dnsPort, "dnsport", 53, "port to listen to dns requests (defaults to 53)")
 	flag.IntVar(&httpPort, "httpport", 6785, "port to listen to HTTP requests (defaults to 6785)")
-	flag.BoolVar(&watch, "watch", false, "watch the docker socket for container events")
+	flag.BoolVar(&watch, "watch", true, "watch the docker socket for container events")
 	flag.Parse()
 
 	var zone = new(weavedns.ZoneDb)