nginx: add proxy parameter
support zoom level 19

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
utils: add error check for load

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
Vagrant: install devel version of tileman

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
doc: add more diagrams

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
add test files

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
prepare for new version