Updated instructions with how to statically link libstdc++, and that RocksDB's make static_lib is required, and updated the software dependency list to include protoc.
Added installation instructions for gcc 4.9, clarified some install text.
fixed typo
fixed typo
Merge pull request #1 from alugowski/master

Updated INSTALL.md with how to statically link libstdc++, and a few other instructions.