Add feeds

[hugovk]

Fixes #543.
Fixes #555.
Fixes #584.
Fixes #585.
Fixes #586.

ADD FEED

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Hi, I want to add my feed to the Python Planet. or I want to change my current feed url from CURRENT_URL_HERE to NEW_URL_HERE

I checked the following required validations: (mark all 5 with [x])

1. My feed is valid, I checked using https://validator.w3.org/feed/check.cgi?url=MY_FEED_URL and it is valid!
2. My feed is a Python Specific feed, e.g: I am proposing the filtered tag or categorized feed url
3. I only post content to this feed which is related to the Python language and its components and libraries. Or content that I consider interesting for the Python community.
4. I am aware that once my feed is added it can take a few hours to start being fetched (according to the server update cycle)
5. My feed contains only content in English language.

Thanks in advance for adding my feed to the PythonPlanet! 👍

NOTE: If you are adding a podcast feed please validate using http://castfeedvalidator.com/

[mikeckennedy]

Wonderful, thanks @hugovk

[stephengruppetta]

Thanks @hugovk