Adds tests for PNG32 vs PNG8 comparison. There is a small frontend to
compare the results from both formats.
Reports similarity when comparing images. Creates png dir.
Removes cartocss rule
Merge pull request #198 from CartoDB/CDB-3664

Adds tests for PNG32 vs PNG8 comparison
Upgrades dependencies
Specifies name in the redis pool
Release 0.24.0
Stubs next version
Checks mapnik version for grainstore is configured, otherwise it uses installed one
Merge pull request #199 from CartoDB/check-mapnik-version

Checks mapnik version for grainstore is configured
Release 0.24.1
Stubs next version
Deprecates psql and starts using cartodb-psql module
Fixes npm-shrinkwrap.json
Merge pull request #200 from CartoDB/use-cartodb-psql

Use cartodb psql
Refactor VectorTileInput into a Datasource class
Merge branch 'master' into mvt

Conflicts:
	npm-shrinkwrap.json
	package.json
Merge branch 'mvt' into exp

Conflicts:
	NEWS
	npm-shrinkwrap.json
	package.json