Remove rendering for highway=byway

Highway=byway should not render, as it has been deprecated for over three years.
Remove rendering for highway=unsurfaced

Highway=unsurfaced is not a highway type.
Change military hatching to 16px and use global alignment

Fixes #97
Change 'beirgarten' to 'biergarten' to fix a typo
Remove rendering of natural=bay areas

Fixes #164

Any natural=bay ways I checked were on top of water anyways.
Merge pull request #199 from pnorman/bay

Remove rendering of natural=bay areas
Merge pull request #197 from mstock/fixes

Change 'beirgarten' to 'biergarten' to fix a typo
Merge pull request #186 from math1985/byway

Remove rendering for highway=byway
Merge pull request #185 from math1985/unsurfaced

Remove rendering for highway=unsurfaced
Merge branch 'military_hatching' of https://github.com/pnorman/openstreetmap-carto into pnorman-military_hatching
Remove unused military symbols.