Two patches from Karl Millar <kmillar@google.com>:
* src/S4_classes.h (rprotobuf): Change handling of
  S4_EnumDescriptor when passed a NULL pointer to just create empty
  object with empty name and full_name rather than setting to
  R_NilValue.
* src/wrapper_EnumDescriptor.cpp (rprotobuf): Change return value
  of getValue* functions on EnumDescriptor and return an
  EnumValueDescriptor or R_NilValue on failure.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@893 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Update version to 0.4.1.1 and update ChangeLog.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@894 edb9625f-4e0d-4859-8d74-9fd3b1da38cb