[NEW] Option to allow to signup as anonymous

...ocketchat-authorization/server/functions/canAccessRoom.js

packages/rocketchat-authorization/server/startup.js

packages/rocketchat-i18n/i18n/en.i18n.json

packages/rocketchat-lib/client/lib/openRoom.coffee

packages/rocketchat-lib/server/methods/getRoomRoles.js

packages/rocketchat-lib/server/startup/settings.js

packages/rocketchat-lib/startup/defaultRoomTypes.js

packages/rocketchat-ui-master/client/main.js

packages/rocketchat-ui-message/client/messageBox.coffee

packages/rocketchat-ui-message/client/messageBox.html

packages/rocketchat-ui-sidenav/client/accountBox.js

packages/rocketchat-ui/client/lib/accounts.js

packages/rocketchat-ui/client/lib/collections.js

packages/rocketchat-ui/client/views/app/room.coffee

server/methods/afterVerifyEmail.js

server/methods/canAccessRoom.js

server/methods/getUsernameSuggestion.js

server/methods/loadHistory.js

server/methods/registerUser.js

server/methods/saveUserProfile.js