Moved statistics to package

packages/rocketchat-lib/package.js

...s/rocketchat-lib/server/methods/generateStatistics.coffee

packages/rocketchat-statistics/lib/rocketchat.coffee

packages/rocketchat-statistics/package.js

...statistics/server/collections/MapReducedStatistics.coffee

...ocketchat-statistics/server/collections/Statistics.coffee

packages/rocketchat-statistics/server/functions/get.coffee

.../rocketchat-statistics/server/functions/getAverage.coffee

packages/rocketchat-statistics/server/functions/save.coffee

...rocketchat-statistics/server/methods/getStatistics.coffee