Pig Stalls

"Master! Our citizens are using pigs to ride around on! This is actually a pretty good idea... we should try monetizing on this, and making a Pig stall for everyone!" Greedy Counselor
 * Name: Pig Stalls
 * Tax Modifier: 50 (5,000 per object)
 * Size: 20*20
 * Protected by the server: No
 * Limit Per City: N/A

Building Requirements:
 * A pig spawner
 * People should be able to saddle and ride pigs.