Trying load on demand.
Merge branch 'dev' of https://github.com/spatialdev/PGRestAPI into dev

* 'dev' of https://github.com/spatialdev/PGRestAPI:
  Trying to stagger .mbtiles loading
  Timed Loop

Conflicts:
	endpoints/tiles/mbtileserver.js

Added UI list for .mbtiles image tiles.
Loading vector .mbtiles and image .mbtiles with a 200 ms delay between each file.
No more tilelive.all, using filesystem.