A few refactorings.

Some of the changes:

  Adds missing apostrophe.
  Adds a new function to Creature to avoid eight code repetitions.
  Removes useless backslash.
  Makes invalid world name messages shorter, simpler and more objective.
Tweak the brew time for various recipes

The original brew times were configured based on their real world values,
regadless of the fact that a (default) year in the Cataclysm DDA world is
about 1/20th of a real year. The times have been adjusted to now take this
into account. E.G. Vinegar will take about 11.5 days to ferment in game,
where it orignally took 60+ days.
Merge branch 'brewing-tweak' of https://github.com/macrosblackd/Cataclysm-DDA into merge