removeField method in Record class
Adding comments to removeField and uncommenting its test method
create basic project structure
Initial Raw test impelementation of Hadoop Input Formats capability
Code restructure
Some refinements on the hadoop input format

This is a combination of commits:
* make hadoop-compat compatible to hadoop yarn and remove org.apache.hadoop code
* Extended usercode wrapper, fixed IF serialization
* introduce pluggable type converter
* make the converter interface more generic; (hopefully) improved fetching logic
Added convenience constructor to RemoteExecutor