Use the new command line syntax in the init script

Hi,

I've noticed that in the init script provided by the 1.0.0.RC2 Debian package, the daemon is started with pre-1.0 arguments : 

```
DAEMON_OPTS="-d -p $PID_FILE -Des.default.config=$CONF_FILE -Des.default.path.home=$ES_HOME -Des.default.path.logs=$LOG_DIR -Des.default.path.data=$DATA_DIR -Des.default.path.work=$WORK_DIR -Des.default.path.conf=$CONF_DIR"
```

According to [the documentation](http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/_system_and_settings.html) we could use a simpler/shorter invocation : 

```
DAEMON_OPTS="-d -p $PID_FILE --default.config=$CONF_FILE --default.path.home=$ES_HOME --default.path.logs=$LOG_DIR --default.path.data=$DATA_DIR --default.path.work=$WORK_DIR --default.path.conf=$CONF_DIR"
```

It's definitely not a blocker, but it would be nice to be consistent.