Bump rspec-rails to avoid bug.

As seen here - https://github.com/rails/rails/issues/1197

Pulled in whatever else got upgraded along the way.
Add ability to limit front page to a given time span.

Could be more useful as the games only go back to October last year but it's a
start.
Add an about page.

Which also means the ability to write simple static pages with markdown.
Handle untrainable skills and boosted skills.

A boosted skill made the regexp halt and there was no corresponding
semantic for untrainable skills.

Also fixed the majority of the failing tests.
Differentiate between games with morgues and without.

The from_log_file state shouldn't be frobbed just because the morgue
was also pulled down. Arguably the logfile data should win over the
morgue data but that's another thing to do.
For now disable crawling most of the content.

Otherwise Google et al will eat all the bandwidth.
Add ability to reload data.

Because occasionally it's lies and I'm too lazy to poke at the DB
every time I need to update a morgue.
Make the "Killer" column more accurate.

Because there are a good deal of endings to a game where the player
wasn't killed by a mob i.e

https://www.refheap.com/paste/11642

^^ Endings where the killer wasn't a mob for 169k odd games in the DB.