changed S3Source class -- implemented pattern match
updated td-import.jar
minor change
changed BulkImportCommand class -- fixed bug: NPE occurred
minor change of Import class
changed BulkImportCommand and CommandHelper classes -- refined messages
changed {LocalFile,S3,}Source classes -- refactoring
changed PrepareProcessor and {CSV,}FileReader classes -- inserted log messages into them
changed TimeColumnSampling class -- fixed bug: NumberFormatException occurred when sample method in CSVFileReader class was executed. SimpleDateFormat objects were used in non synchronized block