Vergence 0.5b released

Vergence 0.5b adds a new threat type and a number of other tweaks. Changelog:

• Added a single page quick setting summary to make it easy to get players up and running.
• Added a new threat type: the Expedition.
• Rebalanced the cost of some upgrades for the Dark Conspiracy threat.
• Rewrote and expanded GM advice on managing NPCs and their abilities. 
• Expanded NPCs and factions.
• Added table for random creature generation.