Handle open-ended ranges
Merge pull request #11 from lorenabrams/fix_table_slice

Handle open-ended ranges
Fixed SheetYielder to provide mutable objects from load. Also made getitem use self.rows when available.
Added version update
Reintroduced single load for SheetYielder
Merge pull request #12 from MSeal/bug/mutableSheetYielder

Bug/mutable sheet yielder
Added xls table writing.
Added worksheet name checking to test.
Added test placeholder back in for generic file loader.
Added sheet yielder str and repr for easier printing
Changed csv reader/writer to default to supporting unicode.
Merge pull request #13 from MSeal/feature/xlsWriter

Feature/xls writer