Hippus mercenaries

[joseasoler]

Consider and tweak the following idea (Avahz Darkwood)

1: Allows a Mercenary Guild to be built/purchased in the Hippus capital (can be captured). 2: Allows all Civs the ability to hire Mounted Mercenaries, and these can only be hired in Hippus capital or captured Hippus capitals. Available with Horseback Riding and is an alternative route to get access to Mercenary units

http://forums.civfanatics.com/showthread.php?t=335194

Take into account issue #101

[joseasoler]

See #115.