Fix broken links in pop-up messages.
Issue #3: Remove nested loop by indexing data using `qid` in memory.

Thanks to focalintent who identified a performance bottleneck. More
information is available at the GitHub.com issue tracker at
https://github.com/meitar/pat-okcupid/issues/3
Bump to v0.2.4. Add "You recently visited" FAQ, link to install guide.
Fixed #2: First run questionnaire automatically saves user's place.
Fixed broken link in the FAQ, update list of changes for version 0.2.4.