Test release for limiting between scans

This is a test release including changes from PR #558

This fixes "Scanning too frequently" error with non-zero betweenScanPeriod and scanPeriod+betweenScanPeriod < 6000, and full-power scanning staying on for foreground scans with a non-zero betweenScanPeriod.

To use this release, you must download the aar file below, 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:2.12-3-g4bf2d9f@aar'
      }

• Create a /libs folder next to the build.gradle above, then download and copy the the android-beacon-library-2.12-3-g4bf2d9f.aar file below into this folder.

• Configure your app's outermost build.gradle File to reference the /libs directory from above in a flatDir declaration:

      allprojects {
          repositories {
              jcenter()
              flatDir {
                  dirs 'libs'
              }
          }
      }