Updating contents comments at the top of the files.
Merge branch 'master' of https://github.com/hotosm/HDM-CartoCSS
Changing hillshading opacity at low zooms and no shading at z0-z3.
Merge pull request #122 from AndrewBuck/master

Update file contents comments and change low zoom hillshading.
Making buildings not show up at z12 or z13.
Merge pull request #123 from AndrewBuck/master

Buildings now show up only at z14 and higher.
First shot of CONTRIBUTING.md
Change compare URL in README