Plugins update, table for registering of busy posts

In this changelog also will be presented changelogs for other versions to for the reason that previous version was not released on github.

Changes

0.3.2

• Deprecate old remove post messages mechanism and add more informative mechanism
  of notifying about removed messages
• Add extension for BroadcaseChannel subscribing for more comfortable interact
  with events channels

0.3.3

• Hotfix for problem with new extension for BroadcastChannels

0.3.4

• Changed return type of forwarders
• Now you can subscribe onto post published events

0.3.5

• Fixed problem with scheduler on initialization (without any event scheduler
  will not update job, but now fixed)

0.3.6

• Add BroadcastReceiver#debounce

0.3.7

• Fix TimerTriggerStrategy calculating delay and put trigger work in
  different async block

0.3.8

BREAK CHANGES

• Add PostsUsedTable, now any plugin or action which can potentially publish
  recommended to register/unregister in this table
• Rename methods of PostsLikesMessagesTable to be consistent with their
  behaviours
• Now plugins HAVE NO VERSIONS and must not implement onInit method