updates #443

In the process refactored the code being tested.

- Move notifications code in MUC to src/converse-notification.js
- Trigger the 'contactStatusChanged' event in RosterContact and not in
  ChatBoxView (which might not exist).

prevous fix wasn't correct. Rename handlers to make it clear which methods are
the event handlers, put them together and make sure docstrings are relevant.

The no-jquery build was broken

According to the require.js documentation, if you are using "require" in HTML,
then the data-main attribute should not be used.

http://www.requirejs.org/docs/api.html#data-main

So merged main.js into converse.js, which appears to solve the problem.

Method has new arg signature now that it's an event handler

Corrected spelling, punctuation and terminology.

Don't make the event "this" context the protected converse object.
Can't trigger multiple data parameters, need to pass an object if there are
multiple values to be sent.

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.