Big overhaul replacing selenium by puppeteer. This does not work for now due to
problems with SSL being a requirement for external endpoints.

`config` => `clientConfig`

fix #66

Reduce eslint bloc size

Server now exposes a callback for the client to notifies it when finished. This
allows the server to clean up the registry.

Careful, this introduces #65 when debugging.

add sinon to 'live-reco-test.js' to mock XMLHttpRequest
delete console.logs from tests

fix #49

The `getMyId` method had incorrect case. It caused errors since it was
called with a different (correct) case elsewhere.

Fix case.

client/lib/live-reco.js indent was all screwed up. fixing it.

No actual code change.

Online reco method will now return a boolean indicating of the method succeded
or failed.
When starting online reco, if it fails, it will be tried again at fixed
intervals.

robot now displays some log when initialized.

Refactored `recordParticipant` in order to extract two independent functions for
getting a STT WS and recording the user stream.

On STT WS error, try to get a new STT WS for the user.

STT lib mock is now extracted into a separate object for cleaner handling.