Merge into master from pull request #33:
OVSDriver: check for zero ttl when processing OF_ACTION_NICIRA_DEC_TTL (https://github.com/floodlight/ivs/pull/33)
Merge into master from pull request #34:
add luajit submodule (https://github.com/floodlight/ivs/pull/34)
ivs: add USE_LUAJIT make flag