v2.5.3

Released to Google Play beta on July 2nd, 2019. Rolled out to production fully on July 11, 2019.

versionCode 105

Bug fixes:

• Fix #943 - Workaround for String.isEmpty() being broken in newer versions of Gradle
• Fix #990 - Interpret alert end time of 0 as unending alert
• Fix #976 - Resolve Guava version conflicts in Embedded Social