Allow to force a csv column into string option
Support for partial instead of full overriding of the schema, by specifying the column name
Generate booleans for ints that only manifest 0 and 1 (when only 0 or only 1 appears, still consider as int)
SafeMode parameter in CsvProvider to make sure all columns support missing values
PreferOptionals parameter for CsvProvider
When PreferOptionals is true, missing values should generate None instead of NaN's
Fix documentation bug

AsTuple is only available in CsvProvider, not in the CsvFile
Support for renaming columns in the Schema parameter
Update Test.fsx
Update SignatureTestCases.config
Update SignatureTests.fs
Merge pull request #173 from ovatsus/CsvImprovements

Csv improvements