goprotobuf -> gogoprotobuf
Merge pull request #997 from mozilla-services/gogoprotobuf

goprotobuf -> gogoprotobuf
Issue #998 pull in the MAX_PATH fix
Add a Logger header to the heka.memstat message

This will allow for proper classification by heka_message_schema.lua
added '__ignore_root' tag option to prevent the build process from importing a repo that has no go files.
Added note to CHANGES about __ignore_root tag on add_external_plugin