Improve fixtures

- better data generation
- better separation between helpers and actual fixtures
Use displayPlay as a param and not an option
Update Gruntfile.js for tests
Fix charts.chart
Fix charts.chart ordering
TO MERGE update doc
Add multiple drill-down
Tips for each fact, dimension, cube, measure, level
Fix data: remove useless input
Add doc for charts
Add doc for charts.chart
Add doc
Use initChartContainerSpecific in wordcloudWithLegend
Fix data.dimension.getGeoProperty
Fix charts.map
Fix button reset filters
Fix removeFilter
Roll up on previously selected members, filtersStack added
Fix drill down selected
Fix setState