* Proposing a new feed experiment
This commit involves tweaking a few subtle aspects of the challenger:
1) Remove the sort by published date on the relevance score. The
articles will now be listed in the order of perceived relevance.
2) Disable a few levers that did little. There really aren't any
`articles.featured = true` articles in the database.
3) Gently increase the weight of each comment in a linear manner.
4) Give a little more weight to posts that don't have followed tags.
In addition, it involves renaming the conversions to better convey their
implementation. This renaming helps create more descriptive labels for
the test results at `/admin/abtests`.
This commit also adds logic to repurpose the AbExperiment feed_strategy
logic; I envision adjusting the weighted feed strategy levers with some
frequency.
Per discussions, I'm also disabling the "not logged in" feed testing.
We'll use the LargeForemExperimental for this.
* Flipping attribute name to positive
Mentally "not disabled" is harder to parse than "enabled". This change
helps with setting an optimistic attribute.
* Bump for travis
* Bump for travis
* Removing file committed by mistake
* Extracting method
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