[Mercure] Add the component#28877

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dunglas wants to merge 13 commits intosymfony:masterfrom

dunglas:mercure

Commits on Oct 12, 2018

Commits on Oct 13, 2018

Remove the messenger handler (use Publisher directly)
dunglas
committed

Commits on Oct 14, 2018

Handle errors. FWBundle config.
dunglas
committed

Commits on Oct 15, 2018

CS
dunglas
committed

Commits on Oct 21, 2018

Update for Mercure 0.2
dunglas
committed

Commits on Oct 22, 2018

Review
dunglas
committed
Fix tests
dunglas
committed

Commits on Oct 23, 2018