Add mode filter for gtfs_shapes and gtfs_stops to windshaft

Fix SQL injection vulnerability

Add modes param to map and move map controls to bottom left
Add mode selector

Add modes to windshaft indicator SQL

Add mode filtering functionality to indicators map
Make mode selection stick between Transit tab and Indicators tab
Small UTFGrid fix
Changed event strings to properties
Merge pull request #413 from WorldBank-Transport/feature/add-mode-filter-on-map

Feature/add mode filter on map