v2.15.0

• Serve .md and .markdown files as text/markdown [bfcafd3]
• Add font MIME types per RFC 8081 [20b446e]
• Mark .mjs files as JavaScript [c00975c]
• Add calendar filetype (.ics) [002a110]
• Block Mercurial .orig files [4c13648]
• Fix enforcing www/no-www with HTTPS [fc747bb]
• Drop Bower support [ee6cd75]
• Fix HTTPS enforcement rule [11e523d]
• Improve inline comments.