v 0.9.0 release

Improvements in this release:

• Updated to work with latest Discourse migrations
• Adding all chat topics to chat category for better user management
• Add ability for admin to manage chats
• Update french, german, and spanish translations
• Fix for emojis unreliability, add emoji suggester for chat composer
• Fix for babble title in Firefox
• Clamp unread count to defined maximum
• Improve tooltips for visibility / channel switcher
• Don't allow links to overflow chat window