removed IActAs custom json converters they can be implemented as ICustomJson
removed last surviving activator.createinstance in favor of the faster extension method
Merge branch 'master' into feature/servicestack.text

Conflicts:
	dep/repositories.config
	src/Nest.sln
created an abstract serializer
removed some unecessary json converters
separated typed untyped serializers
included example ss.text serializer
Moved serialization behind injectable interface and separated the one low level and typed client serialization contracts