minor improvements
change batch wait retry default to 10s
use UTF-8 encoding for String creation
add coercion awareness to cascading taps
add unwrapping of document as field into the entry tuple
complete data unwrapping of documents into Cascading tuple

refactor code to reuse Field alias across Cascading/Hive/Pig
relates to #108
fix bug occurring when parsing an empty list + add tracing
fix minor bug in logging
fix bug causing the tuple to spill over when no fields are defined
improve cascading tests through stream assertions