Also add a config setting for the icon shown in HTML5 notificatins.

updates #443

So that they are retrievable via the API.

updates #443

They're independent of the controlbox and used by other core functions.

- Refactored sound notification to make it a bit more generic
- Split up onMessage

Still have to move the roster code out of src/converse-controlbox.js

Also fixed an issue w.r.t the plugin architecture. Previously infinite
recursion would happen when more than one plugin was overriding a method.

Resolved now by using a wrapper function that lazily sets the correct super
method.

To conform with how many other projects name their directories.

The __ translate method should only be run *after* converse.js has been
initialized and we know what the actual desired language is

Also fix bug in src/locales.js where wrong langs were assigned to wrong keys.

Custom builds like this should rather be done by removing components in
converse.js and then running `make build`

Adding it back again.

It doesn't properly preserve copyright headers from r.js builds.

Strophe.ping.js was still in the no-dependencies build

Also clean up wrapper-end.js a bit as well as the grouping of dependencies in
non_amd.html

Remove locales from utils.js and include it in converse.js so that the locales
can more easily be removed from the build.

Also, remove build-no-locales-no-otr.js

This is now used in non_amd.html and means that the individual converse.js
modules don't need to support the non-AMD case.

Instead of using the deps-*.js files. Builds will currently break, they still
need to be reworked.

Also moved the refreshWebkit method to utils.

Plugins are now also updated so that they can get the closured converse object
directly and don't need to rely on _super.

change xmpp status also on icon-status click

Move the Occupants views and models to converse-muc.js as well as some
MUC-specific config variables.

Add synchronize_presence option