Heroes become widely available

[Arbash]

To make the development of players even more dynamic, following improvements have been introduced:
1. One doesn't need to get the Suzerain rank (five stars). From now on even players with two stars (Captain rank) can hire a hero.
2. The amount of science points needed for the science “Heroes managing” to be studied has been decreased.
3. The prise on hiring a 1 level hero has been decreased.
4. The experience value needed to level up the hero has been decreased.
5. The experience value a hero gets in battles against ruin monsters, has been increased.
6. The building costs of Tavern have been decreased.
7. The building costs of Vault have been decreased.