add 2 more client libraries to README
nsq_to_http: add content-type flag for POST
Merge pull request #230 from michaelhood/feature/nsq_to_http-mime

nsq_to_http: make Content-Type configurable
Merge pull request #169 from mreiferson/go_nsq_improvements_169

go-nsq: Reader improvements
nsqd: TLS negotiation:

* add --tls-cert and --tls-key
* add feature negotatiation to initiate a secure session
* add TLS to Reader (and tests)
* add --tls flags to example utils
* update protocol doc