Fix transaction header encoding

[ddelnano]

Todo

• Encode / decode transaction.Transaction.Request.Headers and transaction.Transaction.Real.Headers as map[string][]string instead of map[string]interface{}
• Fix gob encoding errors that think it is still map[string]interface{}

The intent of this PR is to fix #12 . Still having some issues with the api blueprint and go web server in #12 so this is a WIP still.

[noisyscanner]

@ddelnano did you ever get this working??

[ddelnano]

@noisyscanner I actually don't remember what state I left this in other than that this PR didn't do what I was hoping. I'll try to revisit this issue this week.

[noisyscanner]

@ddelnano that's sound, let me know if you find anything :) I tried to have a brief look but I have noooo idea what's going on 🙃

[ddelnano]

Yea using the gob encoding makes this much more complicated :). I think I wanted to see if I could switch it to use json encoding so that this issue either goes away or when a bug comes up its easy to tcpdump and see the data.