Add JSON.sh as a submodule

https://github.com/dominictarr/JSON.sh
JSON parser written in bash.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
Use JSON.sh instead of jshon

jshon is not on every platform. Luckily, bash is.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>