Anywhere a timedelta is used for parameter, also allow float in seconds

[texasaggie97-zz]

This makes the function call less verbose.
Both will work:

• fetch(timeout=datetime.timedelta(seconds=1.5))
• fetch(timeout=1.5)

[Fladolcetta]

Per discussion we have decided to allow both, this is because we see value in the ease of using a float in seconds and the self documentation of using timedelta.