Improve error reporting
Improve handling of Pig Tuples

change default serialization of tuples to hide/ignore their names. this
results in tuples being pure arrays/lists vs maps (name : list of values)
relates #177
Fix incorrect maven repo for dev builds
Enhance Pig test

relates #187
Polishing

Improve handling connection InputStream for zero-copying in case of
byte arrays
Unwrap buffered data from known InputStreams types instead of copying
Add mapping tests for Pig tests
Move rest.dto package to serialization.dto