fix queue_properties
fix decoding of of1.3 versionbitmap
ofpv4 fix decode_flow_stats
fix ofp_meter_config
fix filter_out_message
Update ofp_v4_decode.erl
Update ofp_v4_encode.erl
Update ofp_v4_encode.erl
Fix encoding/decoding ofp switch configuration
fix meter_band_type
Merge pull request #27 from FlowForwarding/issue87

Fix encoding/decoding ofp switch configuration

Refs: FlowForwarding/LINC-Switch#87
Merge pull request #28 from yamt/fix-meter_band_type

Fix meter_band_type encoding
Merge pull request #23 from yamt/ofp_meter_config

Fix encoding/decoding ofp_meter_config.
Merge pull request #20 from yamt/flowstats-fix

Fix flags decoding in ofp_flow_stats
fixing some type specifications
Merge pull request #19 from yamt/versionbitmap-fix

Fix decoding of of1.3 versionbitmap
Merge pull request #18 from yamt/fix-queue-prop

Fix ofp_queue_properties
Merge pull request #26 from shun159/master

Fix fliter_out_message
Merge pull request #29 from TrafficLab/typespec

fixing some type specifications
Stop treating filtered messages as errors

Each channel has a config for asynchronous messages that can filter what will
be sent to the controller. Filtered message is not an error.