[Csv] Added some tests

[Andrew McNamara]

If you've missed the check-in message, I've added some tests finally
(essentially just the tests from the Object Craft CSV module stripped
down to just those relevant for the excel dialect).

I'm thinking we should organise the tests as:

 - a bunch of tests for each dialect
 - a bunch of tests for each backend parser

-- 
Andrew McNamara, Senior Developer, Object Craft
http://www.object-craft.com.au/