MICASERVER-129 Query builder with aggregation grouping support from coverage page
Merge pull request #150 from obiba/coverage-group-by

MICASERVER-129 Query builder with aggregation grouping support from cove...
MICASERVER-129 Stacked bar charts added when group by is selected
Merge pull request #151 from obiba/group-by-charts

MICASERVER-129 Stacked bar charts added when group by is selected
MICASERVER-126 Variable and dataset pages with coverage link
Merge pull request #152 from obiba/dataset-coverage-link

MICASERVER-126 Variable and dataset pages with coverage link