Merge into master from pull request #159:
Update submodules (https://github.com/floodlight/ivs/pull/159)
update bigcode

* submodules/bigcode bfe3620...fb5370b (2):
  > Merge into master from pull request #28: Add file parsing support. (https://github.com/floodlight/bigcode/pull/28)
  > Merge into master from pull request #27: cjson_util module (https://github.com/floodlight/bigcode/pull/27)
update indigo

* submodules/indigo 2eba645...722379c (1):
  > Merge into master from pull request #130: SocketManager: fix unregistering next timer in the ready list (https://github.com/floodlight/indigo/pull/130)
update loxigen-artifacts

* submodules/loxigen-artifacts 94f034f...fd530ef (1):
  > Artifacts from https://github.com/floodlight/loxigen/compare/8dcf8a2618adfd827a20169c34401ed04a25d383...415d879292453a18b6080c75da2e2975b4513d2e
update switchlight-common

* submodules/switchlight-common 75e734c...a435629 (1):
  > Merge into master from pull request #54: untagged packet support and minor ucli additions (https://github.com/floodlight/switchlight-common/pull/54)