Add 'brick2' cartographer to test whether do compositing in mapnik is faster
Fix commented out code
Overwrite buffer size
Disable load time checking
Control brick2 output image type
Add some comments explaining the cartographer
Add tile render exception to log
Store tile data directly in the memcache for fast retrieve
Replace polymaps view with leaflet (0.7.1)
- Add  metadata.dispname
- Replace tilesvr.wsgi with app.py
- Add missing index.html template
Add `halo-opacity` option to brick2 cartographer
Allow missing metadata while creating cluster storage form config json
Fix unit test error by changing metadata creation from constructor to factory method
Merge branch 'feature/brick2-speedup' into develop