Update to Android API 23 for Android M

Closes #2104

android/java/MapboxGLAndroidSDKTestApp/build.gradle

@@ -4,7 +4,7 @@ buildscript {
         maven { url 'https://maven.fabric.io/public' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:1.3.0'
         classpath 'com.jakewharton.sdkmanager:gradle-plugin:0.12.0'
         classpath 'io.fabric.tools:gradle:1.+'
     }
@@ -38,8 +38,8 @@ gradle.projectsEvaluated {
 }
 
 android {
-    compileSdkVersion 22
-    buildToolsVersion "22.0.1"
+    compileSdkVersion 23
+    buildToolsVersion "23"
 
     repositories {
         mavenCentral()
@@ -48,7 +48,7 @@ android {
     defaultConfig {
         applicationId "com.mapbox.mapboxgl.testapp"
         minSdkVersion 8
-        targetSdkVersion 22
+        targetSdkVersion 23
         versionCode 4
         versionName "0.1.3"
     }
@@ -82,10 +82,10 @@ dependencies {
     compile(project(':MapboxGLAndroidSDK')) {
         transitive = true
     }
-    compile 'com.android.support:support-annotations:22.2.1'
-    compile 'com.android.support:support-v4:22.2.1'
-    compile 'com.android.support:appcompat-v7:22.2.1'
-    compile('com.crashlytics.sdk.android:crashlytics:2.5.0@aar') {
+    compile 'com.android.support:support-annotations:23.0.0'
+    compile 'com.android.support:support-v4:23.0.0'
+    compile 'com.android.support:appcompat-v7:23.0.0'
+    compile('com.crashlytics.sdk.android:crashlytics:2.5.1@aar') {
         transitive = true;
     }
 }