Upgrades mapnik
Merge pull request #230 from CartoDB/upgrade-mapnik

Upgrade mapnik
Release 0.32.2
Stubs next version
adds +1 to first and last date differential to get correct number of steps
amends expected date diff in tests
fix expected values after step fix
Merge pull request #231 from CartoDB/step-fix

Fix incorrect number of steps in Torque
Merge branch 'master' into static-controller