Fix double jsonification and setpool controls

[kkkrackpot]

Hopefully partially fixes the ccminer issue mentioned here #5

[p4u]

I'm not maintaing this code and I've not the infrastructure for testing it with real miners and real pools.

So I'd merge your pool request, just need a confirmation that you tested it deep enough.

[kkkrackpot]

@p4u I tested it for several evenings doing pool-hopping :)
At least for me it works as I want it to work, including reconnections to the same pool with different user/pass credentials. ccminer's errors're also gone.
However, I cant guarantee that it will work for everyone the way they want.
It's a pity that you lost interest to the tool, it's quite a useful thing...

[p4u]

It's a pity that you lost interest to the tool, it's quite a useful thing...

Lack of time and resources...