Remove usage of global geojson in popup
Filters now use DOM to read treks list
Backpack and results now use DOM as trek list
Split main from ui
Load treks asynchronously
Get rid of weird leaflet-objectslayer
Use default extent from settings
Split mess into smaller functions
Remove useless images
Hide filters on page load, until Chosen is loaded (ref #61)
Load trek lists for filters on home page load
Merge pull request #86 from makinacorpus/no_global_geojson

Load geojson asynchronously (fixes #52)