server side JSON
more JSON and a testing account
even more JSON

full compliance with https://gist.github.com/MadhATTER6/6255721 on
server side
newlines again & update balance record on logout
JSON in the phone client and some server bugfixes

Also some exchange specification changes to make the phone-side simpler.
Now complies with the v3 specs found here:
https://gist.github.com/MadhATTER6/6255721
rename serial variables
Merge 'origin/JSON'

We're finally switching over from XML to JSON! This introduces one new dependency in the phone app, JSON.NET
Merge branch 'master' of https://github.com/jizzyjugs/vendttp