Left/Right-hand-traffic: script to update data file + current data file
Left/Right-hand-traffic: create/populate database table
Left/Right-hand-traffic: eval functions lefthandtraffic(), righthandtraffic()
Left/Right-hand-traffic: pseudo classes
Left/Right-hand-traffic: cache result for current render context if possible
Left/Right-hand-traffic: force evaluation of geometry
Left/Right-hand-traffic: tests
Left/Right-hand-traffic: create index on table
Merge pull request #29 from plepe/righthandtraffic

Support :righthandtraffic and :lefthandtraffic  pseudo classes