0.9.2
 - Update libjson to 7.6.1 (fixes bug in the validator)
 - Generalized toJSON method 'matrix' to 'array' to work for higher dimensions.
 - Add option to encode matrix either row-major or column-major.
 - Set default SSL version to 3 for fromJSON("https://...")

0.9.1
 - Major performance improvements for toJSON.data.frame

0.9.0
 - Initial release
