Livechat Survey support

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

packages/rocketchat-livechat/app/.meteor/packages

packages/rocketchat-livechat/app/.meteor/versions

...livechat/app/client/lib/fromApp/RoomHistoryManager.coffee

packages/rocketchat-livechat/app/client/startup/room.coffee

...ages/rocketchat-livechat/app/client/stylesheets/main.less

...chat-livechat/app/client/stylesheets/utils/_octicons.less

packages/rocketchat-livechat/app/client/views/message.coffee

packages/rocketchat-livechat/app/client/views/survey.html

packages/rocketchat-livechat/app/client/views/survey.js

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

packages/rocketchat-livechat/package.js

.../rocketchat-livechat/server/methods/saveSurveyFeedback.js

packages/rocketchat-livechat/server/models/Rooms.js

packages/rocketchat-livechat/server/models/Users.js