Update build (google#100)

- Upgrade Gradle to 3.3
- Update support lib to 25.2.0
- Update BT to 25.0.2
- Update Android Gradle Plugin to 2.3.0

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -23,9 +23,9 @@ task clean(type: Delete) {
 }
 
 ext {
-    buildToolsVersion = '25.0.1'
+    buildToolsVersion = '25.0.2'
     compileSdkVersion = 25
     minSdkVersion = 9
     targetSdkVersion = 25
-    supportLibraryVersion = '25.0.1'
+    supportLibraryVersion = '25.2.0'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip