Update TLS dialog to support the v2 TLS spec

Update the manage name dialog to support the new TLS json format as
discussed at http://dot-bit.org/forum/viewtopic.php?f=5&t=1137

Currently it only supports adding a single TLS record.

![namecoinq-window](https://f.cloud.github.com/assets/6159006/1730120/1a54c5e6-62d4-11e3-9dd5-f052e2f05c86.PNG)