Added simpler example to Writer docs

Getting a basic publisher up and running can be confusing - this is a more canonically simple way to show how it's done.
Merge pull request #41 from russellbeattie/patch-1

Added simpler example to Writer docs
TLSv1 support
Merge pull request #42 from mreiferson/tls_42

TLS support
cleanup Writer (finish_pub shouldn't be a 'public' method)
Merge pull request #43 from mreiferson/writer_cleanup_43

cleanup Writer