Bump the target SDK version to 24 (#120)

build.gradle

@@ -31,10 +31,10 @@ buildscript {
 
 ext {
     minSdkVersion = 9
-    targetSdkVersion = 23
-    compileSdkVersion = 23
-    buildToolsVersion = "23.0.3"
-    supportLibVersion = "23.3.0"
+    targetSdkVersion = 24
+    compileSdkVersion = 24
+    buildToolsVersion = "24.0.2"
+    supportLibVersion = "24.2.0"
     espressoVersion = "2.2.2"
     testRunnerVersion = "0.5"
     junitVersion = "4.12"

circle.yml

@@ -9,7 +9,7 @@ machine:
 
 dependencies:
     pre:
-        - echo y | android update sdk --no-ui --all --filter "build-tools-23.0.3"
+        - echo y | android update sdk --no-ui --all --filter "android-24,build-tools-24.0.2,tools,platform-tools,extra-android-m2repository"
         # For some reasons, there is an issue with the pre-installed gcloud that
         # PyOpenSSL is not available when trying to activate the service account.
         # Re-installing the gcloud worked as a workaround.