Sync

- Default TLS cipher selection, with override (thanks to Zed Jorarard).
- Updated documentation.

src/TLSClient.h

@@ -40,6 +40,7 @@ public:
   void limit (int);
   void debug (int);
   void trust (bool);
+  void ciphers (const std::string&);
   void init (const std::string&, const std::string&, const std::string&);
   void connect (const std::string&, const std::string&);
   void bye ();
@@ -51,6 +52,7 @@ private:
   std::string                      _ca;
   std::string                      _cert;
   std::string                      _key;
+  std::string                      _ciphers;
   gnutls_certificate_credentials_t _credentials;
   gnutls_session_t                 _session;
   int                              _socket;