Allow modules to get instances of StreamsJacksonMapper that can process additional DateTime formats

StreamsJacksonMapper has support for RFC3339 but many channels use other timeformats. StreamsJacksonMapper has been optimized for streams and should be used everywhere, yet currently modules must override it to process non-standard dates. It would be preferable if StreamsJacksonMapper .getInstance accepted a list of additional Joda Strings that should be supported.