#111 Create import/export module based on meta reflection

[Luca Garulli]

It could be useful having a generic purpose module that import/export objects in CSV format. Something like this:

Employee.csv:
-----------------
name,surname,boss(Employee:name+surname),salary,company(Company:name)
"Giuseppe","Verdi",,1000,("AssetData")
"Luca","Garulli",("Giuseppe"+"Verdi"),100,("AssetData")

And a default ant task able to import and export data in this simple format. This is very useful weapon on schema changes