removed -callback for R14B03|4 compatability

I left the newer code commented out. The only thing I was unsure of is line 115 in ranch_ssl.erl: 

```
-spec connect(string(), inet:port_number(), any()) -> {ok, ssl:sslsocket()} | {error, term()}.
```
`ssl:sslsocket()` is an undefined type.

Also, please advise on what branch this PR should be merged and tagged against.