Added new question about Torque and polygons
Fix with @javisantana tips.
Fixing with @iribirri comments.
Merge pull request #113 from CartoDB/FAQ_Question_about_Torque_and_polygons

Added new question about Torque and polygons
Closed with commit 17eabe96e1829be57c7f06148417f7c1c6ffdc5d