First release

[nuclear868]

This is the first release, with complete basic features.

• Sending and receiving messages is functional.
• Sending and receiving files is functional too.
• The server is notified when a channel is being viewed and channel view notifications from server are handled. This means that the notifications will work properly when using Mattermost on multiple devices.
• If a reconnect occurs, the chat history is synchronized with the server, so that no messages are lost.
• Cache is used for faster image loading.

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This discussion was created from the release First release.