Conversations: Add MaxRecipients logic for AddPeople module
Conversations: implement MaxRecipients in Add form
Conversations: implement MaxRecipients in tokenizer
Conversations: tokenLimit fixes
Conversations: Add inheritance w/CheckForSpam; fix count bugs
Merge branch 'stage' of github.com:vanilla/vanilla into feature/pmfloodcontrol

Conflicts:
	applications/conversations/js/conversations.js
Conversations: simplify new translations
Fix docblocks in ConversationModel
Merge pull request #1919 from vanilla/feature/pmfloodcontrol

Feature/pmfloodcontrol