Allow starting foreground service at boot on Android 8+ (Release 2)

This is an ad-hoc test release intended to fix the issue reported in #7046

To use this release, you must download the aar file attached to this release, and configure it with your project like so:

• Edit your innermost build.gradle file to add the beta library AAR as a dependency like so:

      dependencies {
        compile 'android-beacon-library:fix-start-foreground-service-at-boot-release-1-1-g75f756f@aar'
      }

• Create a /libs folder next to the build.gradle above, then download and copy the aar file attached to this release into this folder.