Version 1.8

Copy the unzipped epub.qlgenerator file into /Library/QuickLook (for all users) or ~/Library/QuickLook (for the current user only).

Copy the unzipped epub.mdimporter file into /Library/Spotlight (for all users) or ~/Library/Spotlight (for the current user only).

V1.8 pulls in a in a bunch of under-the-hood updates from @MaddTheSane.
Added BSD license.

Version 1.7

Copy the unzipped epub.qlgenerator file into /Library/QuickLook (for all users) or ~/Library/QuickLook (for the current user only).

Copy the unzipped epub.mdimporter file into /Library/Spotlight (for all users) or ~/Library/Spotlight (for the current user only).

Updated epub.qlgenerator with a version built with Xcode 7.

Version 1.6

Copy the unzipped epub.qlgenerator file into /Library/QuickLook (for all users) or ~/Library/QuickLook (for the current user only).

Copy the unzipped epub.mdimporter file into /Library/Spotlight (for all users) or ~/Library/Spotlight (for the current user only).