Instead of calling super.init, calling Thread.init so it is consistent with other similar calls in different parts of SpiNNaker toolchain
Added missing call to Thread init in scp_listener and resolved PEP8 related warnings
Resolved most of the PEP8 related warnings
Added blank files for testing scp message implementations
Tested connection queue and message callback and partially scp listener
Merge remote-tracking branch 'origin/master'