Wildcards mechanism added to 'env' section

I was missing this feature a bit. Created simple mechanism to handle wildcards for `env` section 

```ini
[watcher:worker1]
cmd = ping 127.0.0.1

[watcher:worker2]
cmd = ping 127.0.0.1

[env:worker*]
PATH = /bin
```

Both `worker1` and `worker2` will be run with PATH = /bin