added data, diagrams and more details
Merge github.com:nosql/aggregations-2
changed extension of geojson data
added ex2
few fixes in readme of ex2
fixed geojson files to render properly in github
removed mongo specific columns from geojson files
Merge github.com:nosql/aggregations-2
added link to ex2 in README
style fix in ex2
Merge pull request #141 from mszygenda/master

Zadanie 2 + Poprawienie wyświetlania geojson