Disabled gocylco for now, need to use gometalinter to disable
conditionally. There are also a lot more linters we could use, but they
cause too many issues to start today.
* Make sure errors in SCTP make it all the way back
* Move structs into files with proper names in SCTP
* Add String() for AssociationState enum
* Add callbacks to Association to that we can handle
DATA in the DataChannel package and send outbound SCTP
