TypeError Handling

[brentru]

Issue:
When a feed is called which doesn't exist, a 404 is not returned. Instead the following is returned:

TypeError: the JSON object must be str, not 'bytes'

Platforms Effected by Issue:
Python Ver <3.6

Patch Notes:

• Python3.6.x can handle str, bytes, bytearray with builtin JSON but Python3.5.x (which ships with Debian Stretch) can't. We switched response handling to str instead of bytes using the requests library in errors.py.
• Edited simple.py to reflect API-V2 and feed check/generation.

Issue referenced:
#58
#57
https://forums.adafruit.com/viewtopic.php?f=56&t=138210

[jerryneedell]

I tried this (from the fix_typerror branch) on my Raspberry Pi and it worked under both python3.5.3 and python3.6.5. In both cases, I ran it with the "test" feed non-existent and it created it successfully.