stanza_router: Fix for subscriptions to users on components [0.4 branch only]

mod_register: Attach session to user-registered and user-deregistered events

core: hosts[*].events

Merge with 0.4

mod_saslauth: Fix logic error which prevented SASL ANONYMOUS from working

mod_welcome: New plugin to welcome users who register on the server

mod_register: Fire events and log on account creation/deletion

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mercurial