v0.5.0


* Added support for async transforms #24
* Added support for async validation
* Added support for new data format
```
[
    [["header", "value1"], ["header2", "value2"]],
    [["header", "value2"], ["header2", "value2"]]
]
```
* Added support for forcing the quoting columns and headers
   * `quoteColumns` - Can be a boolean, object or array to specify how quoting should be done (see README)
   * `quoteHeaders` - Can be a boolean, object or array to specify how quoting should be done (see README)
* More tests
* Code refactor and clean up