Rely on SDK manager plugin instead of Travis

.travis.yml

@@ -1,11 +1,5 @@
 # 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-google-m2repository
 
 script:
   - ./gradlew test

app/build.gradle

@@ -2,8 +2,12 @@ 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'
 
@@ -40,9 +44,8 @@ dependencies {
     compile 'com.squareup.dagger:dagger:+'
     provided 'com.squareup.dagger:dagger-compiler:+'
 
-    // TODO: Figure out why I need to force 2.1.0 and can't just use +
-    compile 'de.devland.esperandro:esperandro-api:2.1.0'
-    provided 'de.devland.esperandro:esperandro:2.1.0'
+    compile 'de.devland.esperandro:esperandro-api:+'
+    provided 'de.devland.esperandro:esperandro:+'
 
     compile 'com.jakewharton:butterknife:+'
     compile 'com.readystatesoftware.systembartint:systembartint:+'