Merge pull request #1 from szilardhuber/master

Changed makefile to be able to sudo make install.
Merge pull request #2 from szilardhuber/master

Improved the skeleton of the FDW. Now able to return some dummy integers...
Added usage of ZeroMQ and Google Protocol Buffers. Tons of shortcuts but will solve them soon.
Added submodule + deleted protobuf.
Moved proto files to submodule.
Submodule.
Merge branch 'master' of github.com:szilardhuber/virtdb-fdw