Bugfix: fall back to nick if the JID is not available.

so that we have automatic event deregistration when the model gets removed.

if it's the only search hit.

new search term includes the previous one

Also, don't show the categories while searching.

instead of returning the fullname as fallback in `getNickname`

We first want to check whether the user has registered a nick with the
MUC, and if so, that will be set as the nick.

...since `locked_domain` needs to be "domain.tld" and can't be just `true`... or maybe `locked_domain` needs editing instead?

Use it to generate dist/converse-no-dependencies.js which we use to
generate the converse.pot file.

- Add postcss with autoprefixer and cleancss

Also, remove the Promise polyfill. We don't support browsers which don't support promises.

- hot reloading
- split config into dev and prod

- Removes the need for generating and keeping json files