settings for livechat title and background color

packages/rocketchat-lib/settings/server/publication.coffee

...ges/rocketchat-livechat/app/client/lib/collections.coffee

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

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

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

packages/rocketchat-livechat/config.js

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

packages/rocketchat-livechat/i18n/pt.i18n.json

packages/rocketchat-livechat/package-tap.i18n

packages/rocketchat-livechat/package.js

packages/rocketchat-livechat/rocket-livechat.js