Release 0.4.2

Changes in RProtoBuf version 0.4.2 (2014-12-10)

• Address changes suggested by anonymous reviewers for our Journal of Statistical Software submission.

• Make Descriptor and EnumDescriptor objects subsettable with "[[".

• Add length() method for Descriptor objects.

• Add names() method for Message, Descriptor, and EnumDescriptor objects.

• Clarify order of returned list for descriptor objects in as.list documentation.

• Correct the definition of as.list for EnumDescriptors to return a proper list instead of a named vector.

• Update the default print methods to use cat() with fill=TRUE instead of show() to eliminate the confusing [1] since the classes in RProtoBuf are not vectorized.

• Add support for serializing function, language, and environment objects by falling back to R's native serialization with serialize_pb and unserialize_pb to make it easy to serialize into a Protocol Buffer all of the more than 100 datasets which come with R.

• Use normalizePath instead of creating a temporary file with file.create when getting absolute path names.

• Add unit tests for all of the above.