Merge pull request #4 from FreekDB/master

Changed file path to main export file from constant (EXPORT_FILE_PATH) into second command-line parameter.
Changed KPath to NamePath.
Merge remote-tracking branch 'upstream/master'
Correcting back to namePath after failed merge.
Created the class ExportFile.java from a module in I2B2ODMStudyHandler.java
Improvements to the FileExporter class. Creation of a new package nl.vumc.odmtoi2b2.export for this class.
Some minor changes to resolve a few warnings and a few code style issues.