Fix documentation typos, endpoints and replace all /tiles with /api/v1/map
Allow a different cache-control max-age for layergroup responses
Merge pull request #226 from CartoDB/layergroup-ttl

Allow a different cache-control max-age for layergroup responses
Release 1.21.0
Stubs next version
Upgrades windshaft to 0.32.0
Merge branch 'master' into pgraster

Conflicts:
	npm-shrinkwrap.json
	package.json