* update handshake to match spec
* add test for version
* add test for open try
* add more tests
Add a test for supplied versions that do not function with previous connection states in INIT and TRYOPEN
* update godoc
* update version checks to switch
Update the version checks in ConnOpenAck to use a switch to increase readability of the code as well as provide custom error messages for each possible case that may occur. Slighly modified version to review suggestion by @fedekunze
* add intersection comments to handshake and pick version
* remove old code
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