Update dependencies; Minify css on production
Update, since we’re not using multiple buildpacks

We were… But we’re not anymore.
Make pandoc_scratchblocks a submodule

Fixes #85.
Reword dependencies
`make clear` shouldn’t remove /lib
Add an error if scratchblocks_filter isn’t present
Merge pull request #96 from andylolz/85-pandoc-submodule

Make pandoc_scratchblocks a submodule
Merge pull request #95 from andylolz/dependencies

Update dependencies; Minify css on production
We definitely do need typecsset, so re-add it.
Merge pull request #102 from andylolz/master

We definitely do need typecsset, so re-add it.
Merge branch 'master' into pdf-styling