add hybrid decoder again

This reverts commit 178eb7c6553208a2325888f29ccbbc0a2bb221b7.

Conflicts:
	src/main/java/com/linkedin/camus/etl/kafka/mapred/EtlInputFormat.java
	src/main/java/com/linkedin/camus/etl/kafka/mapred/EtlRecordReader.java
add start script + example config