Changed edit to editedAt and editedBy

client/methods/updateMessage.coffee

client/views/app/message.coffee

packages/rocketchat-lib/server/functions/setUsername.coffee

packages/rocketchat-lib/server/models/Messages.coffee

server/methods/loadHistory.coffee

server/methods/loadMissedMessages.coffee

server/methods/updateMessage.coffee

server/startup/migrations/v22.coffee

server/stream/messages.coffee