Remove spam-filter module and associated code

[humphd]

We're having issues using the https://www.npmjs.com/package/spam-filter module, since it depends on a really old version of node. Let's remove it, or replace it.

We're not currently using spam filtering at all, so it's critical to have this (yet).

[cindyorangis]

Seeing how spam-filter hasn't been updated in 2 years and depends on node 8 and npm 5... I started digging around our packages to see which ones are also in the same boat where it hasn't been updated in a while.

opml-generator (5 years ago)
parse-github-url (2 years ago)
passport (2 years ago)
passport-openid (4 years ago)
reading-level (2 years ago)
wordcount (4 years ago)
valid-url (6 years ago)

These aren't complaining now but I'm worried that they might complain in the future @_@
Am I overthinking or are these ticking time bombs?

[c3ho]

@cindyledev Thank you for the good point. As she pointed out, this hasn't been updated in 2 years and its dependencies will conflict with the rest of our other libraries. We have decided to remove the spam-filter module and remove any tests associated with the module.

[c3ho]

@humphd are you ok with me assigning it to you so your students can take this issue?

[humphd]

That, or assign it to yourself, and you can mentor. Either works.

[humphd]

I'm going to steal this...