Implemented chart statistics

- Navigate to http://helloworld.free.bg/varnalab
- click on log (upper right corner)
- open up developer tools and copy/paste the json data (under red headers)
- run `CELL_MODE=development node scripts/preseed-fixture/index.js`
- if anything fails drop the collection and try again (sometimes the unique indexes are a problem)
- start the app and navigate to http://localhost:8080/charts