Merge branch 'gradle-2.14.1' into 'master'

Upgrade gradle to 2.14.1 and gradle plugin to 2.1.3.



See merge request !292

build.gradle

@@ -14,7 +14,7 @@ buildscript {
 	}
 
 	dependencies {
-		classpath 'com.android.tools.build:gradle:2.1.2'
+		classpath 'com.android.tools.build:gradle:2.1.3'
 		classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
 		classpath 'de.undercouch:gradle-download-task:2.1.0'
 		classpath files('briar-core/libs/gradle-witness.jar')

gradle/wrapper/gradle-wrapper.properties

-#Thu May 12 13:08:34 BST 2016
+#Wed Aug 24 10:55:42 BST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip