renaming package external to livechat

.meteor/packages

.meteor/versions

.travis.yml

build.sh

...es/rocketchat-external/app/client/lib/chatMessages.coffee

...at-external/app/client/methods/sendMessageExternal.coffee

packages/rocketchat-external/app/client/routes/router.coffee

...ges/rocketchat-external/app/client/startup/visitor.coffee

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

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

packages/rocketchat-external/livechat.coffee

packages/rocketchat-external/methods.coffee

packages/rocketchat-external/package.js

packages/rocketchat-external/plugin/build-external.js

packages/rocketchat-external/plugin/build.sh

packages/rocketchat-external/rocket-external.js

packages/rocketchat-lib/server/sendMessage.coffee

server/methods/createDirectMessage.coffee