* refactor(chalice): upgraded dependencies
* refactor(chalice): upgraded dependencies
feat(chalice): support heatmaps
* feat(chalice): support table-of-browsers showing user-count
* feat(chalice): support table-of-devices showing user-count
* feat(chalice): support table-of-URLs showing user-count
* fix(chalice): fixed Math-operators validation
refactor(chalice): search for sessions that have events for heatmaps
* refactor(chalice): search for sessions that have at least 1 location event for heatmaps
* fix(DB): replaced click's x&y with normalized_x&normalized_y
fix(chalice): fixed heatmaps-clicks-path
refactor(DB): DB upgrade & downgrade scripts
