Merge pull request #42 from mozilla-services/pack_numerics

Pack repeated numeric fields in the protobuf serialization
Fix the redefinition of MAX_PATH

https://github.com/mozilla-services/heka/issues/998
Merge branch 'dev' of github.com:mozilla-services/lua_sandbox into dev
Merge branch 'dev' into pack_numerics_with_gogoprotobuf_fix