Pretty large development merge. Including:
- More robust PHP error handling.
- Automatically update release data from various sources. Manually
updating a json file was too error prone.
- Normalize hashes of release notes, so that they won't need to be
manually updated so often.
- Small improvements to quickbook page data.
- Cache html generated from quickbook - so no need to reparse when
changing release data. Much of the site can now be rebuilt without
installing quickbook, although changes in quickbook won't be included.
- Scripts in site-tools have are more consistent at the command line,
and all support '--help' (although some have very little information).
- Automatically update more of the site for new releases.
I didn't want to use the existing mustache, as I want to keep the site
dependency free for now, and not have to deal with caching compiled
templates. Might switch to using composer on the site in the future.
This isn't full mustache syntax, and might behave slightly differently?
