Specified the Jekyll configuration options to have a better sense of
control over everything. Most of the settings are already set by default.
Added the redcarpet2 plugin from @nono.
Dropped the post-level permalink options from two posts. That option was breaking my Related Links block.
Fixed another permalink issue. I was using categories when I should have used tags.
Put some metadata at the top of post layouts. There's some extra stuff in there too but I've commented it out because it isn't working properly yet.
Exluded the `_cache` directory. Added a random favicon.