As of SDK Tools 25.1.7 and Intel x86 Atom_64 System Image Rev. 6, it appears that there is no longer a separate emulator image for the Google APIs - instead, the normal emulator image now includes the Google APIs by default. So, the message shown in the "Recommendation" section when creating an AVD appears to be old/incorrect.
I was able to run this project (using gradlew installObaGoogleDebug
), which requires Google Play Services for maps and other items, by selecting Nougat / API Level 24 / x86_64 / Android 7.0.

EDIT Nov. 3rd 2016
It appears this was a temporary issue with the emulator image. As of SDK Tools 25.2.2 and Intel x86 Atom_64 System Image Rev. 7, when I try to run the same app on the same emulator image (API Level 24) I created above, it now says "OneBusAway relies on Google Play Services, which is not supported on your device".
However, it looks like there is now an API Level 25 (Android 7.1.1) emulator w/ ABI x86_64 available for download that does explictly include the Google APIs - see area circled in red below (note that the update message still seems to erronouesly appear):
