Change default CSV delimiter to comma (fix #79)
Merge pull request #80 from ddeboer/csv-delimiter

Change default CSV delimiter to comma (fix #79)
FIX FOR: MappingItemConverter skips null fields #84 (Fix converters not being applied to null values -- now also for mappingitemconverter)
Merge pull request #85 from elektrostress/master

FIX: MappingItemConverter skips null fields
Improve Excel reader performance and compatibility
Properly implement fluent interface in all writers.

Signed-off-by: Benoît Burnichon <bburnichon@gmail.com>
Merge pull request #88 from bburnichon/ticket_87_writer_fluent_interface

Add proper writer fluent interface tests
Return Result Object