Merge branch 'FPIIM_305' into 'master'

Bump ProgrammableButton targetSdkVersion

See merge request !2
diff --git a/build.gradle b/build.gradle
index fac5db5..4baa8e5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,13 +21,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 21
+    compileSdkVersion 23
     buildToolsVersion "21.1.2"
 
     defaultConfig {
         applicationId "com.fairphone.programmablebutton"
         minSdkVersion 17
-        targetSdkVersion 21
+        targetSdkVersion 23
     }
 
     buildTypes {
@@ -65,5 +65,5 @@
 }
 
 dependencies {
-    compile 'com.android.support:support-v4:21.0.+'
+    compile 'com.android.support:support-v4:23.4.0'
 }