use StreamsJacksonMapper with channel-specific date support
deprecate StreamsTwitterMapper
deprecate StreamsDatasiftMapper
use generic TypeConverterProcessor
deprecate/delete now unnecessary classes
refactor event classification
add event classification tests
refactor channel serialization
update tests
deleting this was a mistake
adding new test to SCM
Merge branch 'STREAMS-212' of https://git-wip-us.apache.org/repos/asf/incubator-streams into STREAMS-212
need to add these classes to SCM
add license header
Merge branch 'master' into STREAMS-212
revamped testing, more cases more conditions per test