Date object serialization has been added
Date object serialization has been added upgrade\research finish notification has been added not tested
Merge branch 'research.persistence' of github.com:kewgen/aow into research.persistence

Conflicts:
	common/gen.src/com/geargames/serialization/serializers/NewResearchSTDeserializer.java
	common/gen.src/com/geargames/serialization/serializers/NewResearchSTSerializer.java
	common/gen.src/com/geargames/serialization/serializers/NewUpgradeLevelSTDeserializer.java
	common/gen.src/com/geargames/serialization/serializers/NewUpgradeLevelSTSerializer.java