Bump android build tool version.

android10 · android10 · commit d26d47f438c9 · 2015-06-21T01:05:04.000+02:00
diff --git a/buildsystem/dependencies.gradle b/buildsystem/dependencies.gradle
@@ -6,7 +6,7 @@ allprojects {
 
 ext {
   //Android
-  androidBuildToolsVersion = "21.1.2"
+  androidBuildToolsVersion = '22.0.1'
   androidMinSdkVersion = 15
   androidTargetSdkVersion = 21
   androidCompileSdkVersion = 21
