[5.3] Fire BelongsToMany relation events for attach/detach/sync/toggle#14988

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jarektkaczyk wants to merge 2 commits intolaravel:5.3from jarektkaczyk:5.3-fire-BelongsToMany-relation-events

+345-92

Commits on Aug 24, 2016

fire eloquent events on BelongsToMany operations (sync/attach/detach/toggle) + refactored brittle tests
jarektkaczyk
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Added model registrars for BelongsToMany events
jarektkaczyk
committed