[Transformer] Be more flexible by passing directly the whole context instead of only target
update test
Merge pull request #19 from tyx/fix/callback-transformer

[Transformer] Be more flexible by passing directly the whole context
Add missing implements statement to DBALLoader and ORMLoader
Merge pull request #21 from K-Phoen/master

Add missing implements statement to DBALLoader and ORMLoader
Add an XLS extractor based on PHPExcel
Merge pull request #22 from K-Phoen/xls-extractor

Add an XLS extractor based on PHPExcel