Make ByteStrings serializable with java serialization.
Add oneof keyword to proto.vim
Fix typo
Merge pull request #110 from nsuke/tb-typo-cpp_extension

Fix typo
Merge pull request #109 from nsuke/tb-vim-oneof

Add oneof keyword to proto.vim
Add tests for other ByteString subclasses
Merge pull request #102 from fizbin/bytestring_serializable

Make ByteStrings serializable with java serialization.