revert to build v24 to to lack of drone CI support

AndroidManifest.xml

@@ -25,7 +25,7 @@
 
     <uses-sdk
         android:minSdkVersion="14"
-        android:targetSdkVersion="25" />
+        android:targetSdkVersion="24" />
 
     <!-- GET_ACCOUNTS is needed for API < 23.
         For API >= 23 results in the addition of CONTACTS group to the list of permissions that may be

build.gradle

@@ -10,7 +10,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.2'
+        classpath 'com.android.tools.build:gradle:2.2.1'
     }
 }
 
@@ -20,7 +20,7 @@ apply plugin: 'pmd'
 apply plugin: 'findbugs'
 
 ext {
-    supportLibraryVersion = '25.0.0'
+    supportLibraryVersion = '24.2.1'
 
     travisBuild = System.getenv("TRAVIS") == "true"
 
@@ -88,8 +88,8 @@ android {
         htmlReport true
         htmlOutput file("$project.buildDir/reports/lint/lint.html")
     }
-    compileSdkVersion 25
-    buildToolsVersion "25.0.0"
+    compileSdkVersion 24
+    buildToolsVersion "24.0.2"
 
     defaultConfig {
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"