adding leaflet map
Merge pull request #738 from OCHA-DAP/dev-dashboard-changes

#691
Merge pull request #740 from OCHA-DAP/dev-dashboard-changes

#691
#649 - style dropdowns
         - fix the info fields position
#649 - fix dropdown when it's above the select box
Merge pull request #746 from OCHA-DAP/arti-layout-changes

Arti layout changes
Merge pull request #742 from OCHA-DAP/dataset-map

adding leaflet map
#691