Merge pull request #78 from zijistark/crusade-dev

Crusader state formation improvements
Tribal Invasion CB Fix

Fixed tribal invasion cb
Merge pull request #79 from Jaidal/beta

Tribal Invasion CB Fix
Never give a crusader state to a heretic or infidel
Crusader state succession law normalization when non-feudal character wins

Fixes long-standing bugs that could have been increased in frequency
due to recent changes.  Also fixes AI de jure capital-setting under
such circumstances.