Merge pull request #13 from dimaki/master

Added setter for script home and fixed null check
FilterExpression access to script variables is unified.
"DevNull" consumer of unmapped fields introduced
SkipFirstRow is configurable with pipeline
setValue exposed, empty string is converted to a zero double
DMS to double conversion implemented
DMS also works with single-dotted values
superfluous scriptTag removed
Row count uses Row memory.
All rows access the same memory instance
Processing errors are gathered in Memory
Pump returns memory after processing
Erroneous rows are stored in memory
Error handling implemented
stopOnError is working
findColumnsAndApply is working
findColumnsAndChangeName implemented
RowSink introduced
RowSink introduced
Script name is displayed on error
Script fixed