v0.8.0

This release brings you two things:

• IncrementalParquetWriter by @alexklibisz allows you to write data to a single file before you decide to close it.
• Fix for a bug found by @darmbrus. He noticed that HadoopConfiguration was not processed by ParquetReader so passing options programmatically to the reader virtually took no effect. We are terribly sorry for that but it should be fine since now!