Prepare 1.7.3 release

Bump versionCode for 1.7.2 release

Prepare 1.7.1 release

Add missing curlies

Prepare 1.6.1 release

Add version to zipaligned APK file name

Return in case statement instead of falling through

Only allow item selection if orgs are non-empty

The org count being empty means they did not successfully
load so don't allow further navigation in this case.

Add helper for getting number of orgs

Return hash of e-mail in else clause

GravatarUtils guards against an empty string so the
check does not need to be duplicated in AvatarLoader