0.6.0

New java extensions capability with add_jar, add_function and add_extension
Additional params can be passed at src creation, courtesy @MarcinKosinski
cross_join added
Many small changes and bug fixes
- fix #7
- CSV reader fails early by default rather than skipping bad rows
- Preparations for null values support in CSV, pending spark updates
- make mode argument to CSV reader explicit
- drop NAs in tests until supported in spark
- switch to rzilla org and achive.rzilla.org package archive
- workaround for tidyverse/dplyr#1651
- more dealing with backend case insensitivity
- fix print info for Hive src
- some intial support for backend types such as maps and structs (not available to user yet, but ask if you need it)

Previous releases