build: bump tools

* use gradle 3.3
* use gradle plugin 2.3
* use support library 25.2.0
* use NDK r14

Change-Id: I5bb1e677116d8ddb582ace1ab09a01a0688221c2
diff --git a/ring-android/gradle/wrapper/gradle-wrapper.properties b/ring-android/gradle/wrapper/gradle-wrapper.properties
index 17faa2b..3718ea2 100644
--- a/ring-android/gradle/wrapper/gradle-wrapper.properties
+++ b/ring-android/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Aug 09 11:15:04 EDT 2016
+#Fri Mar 03 14:43:03 CET 2017
 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