BUG: repost is not matched when filtering tracks from profile

[adrienjoly]

steps to reproduce:

1. I add (repost) a track from another openwhyd user, by using the "add to" link of one of the search results
2. I go to my user profile => I see the track on top of my tracks
3. I activate the track filter and type one of the words of the track's title => it does not show up in the list of filtered tracks

objective: a reposted track should be indexed for all the (re)posters

steps for solving:

• [ ] add automated tests for indexing of posted tracks (should pass), and of re-posted tracks (should fail)
• [ ] fix: index re-posted tracks for the person who reposted it
• [ ] also update the complete re-indexing procedure (in /app/controllers/admin/index)
• [ ] submit a pull request
• [ ] when pull request was accepted and added to production, ask @adrienjoly (admin) to re-populate the index

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[adrienjoly]

UPDATE:

• works for that reposted track: https://openwhyd.org/c/596b510102e1b45127d46bea
• but not for that one: https://openwhyd.org/c/596b4cf302e1b45127d46a3a