Try and get the API 21 build going again...

.travis.yml

@@ -1,5 +1,12 @@
 # We still need android to get the build tools/support libraries
 language: android
+android:
+  components:
+    - build-tools-21.1.1
+    - android-21
+    - extra-android-support
+    - extra-android-m2repository
+    - extra-google-m2repository
 
 script:
   - ./gradlew test

app/build.gradle

@@ -2,12 +2,8 @@ buildscript {
     repositories {
         mavenCentral()
     }
-    dependencies {
-        classpath 'com.jakewharton.sdkmanager:gradle-plugin:0.12.+'
-    }
 }
 
-apply plugin: 'android-sdk-manager'
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'