Update gradle to 4 and gradle compile plugin

OsmAnd/.gitignore

@@ -1,3 +1,7 @@
+gradle
+gradlew
+gradlew.bat
+ 
 valgrind/
 bin/
 dist/

OsmAnd/build.gradle

@@ -385,10 +385,10 @@ dependencies {
 	// compile project(':eclipse-compile:design')
 	// compile project(':eclipse-compile:cardview')
 	// compile project(':eclipse-compile:gridlayout')
-	compile 'com.android.support:gridlayout-v7:25.3.1'
-	compile 'com.android.support:cardview-v7:25.3.1'
-	compile 'com.android.support:appcompat-v7:25.3.1'
-	compile 'com.android.support:design:25.3.1'
+	compile 'com.android.support:gridlayout-v7:26.+'
+	compile 'com.android.support:cardview-v7:26.+'
+	compile 'com.android.support:appcompat-v7:26.+'
+	compile 'com.android.support:design:26.+'
 	compile fileTree(include: ['*.jar'], exclude: ['QtAndroid-bundled.jar', 'QtAndroidAccessibility-bundled.jar', 'OsmAndCore_android.jar', 'OsmAndCore_wrapper.jar', 'android-support-multidex.jar'], dir: 'libs')
 	legacyCompile "net.osmand:OsmAndCore_android:0.1-SNAPSHOT@jar"
 	qtcoredebugCompile "net.osmand:OsmAndCore_androidNativeDebug:0.1-SNAPSHOT@aar"

OsmAnd/project.properties

@@ -10,7 +10,7 @@
 # Indicates whether an apk should be generated for each density.
 split.density=false
 # Project target.
-target=android-23
+target=android-26
 dex.force.jumbo=true
 android.library.reference.1=../eclipse-compile/appcompat
 android.library.reference.2=../eclipse-compile/design

OsmAndCore-sample/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    buildToolsVersion "25.0.0"
 
     dexOptions {
         jumboMode true

build.gradle

@@ -1,9 +1,13 @@
 buildscript {
     repositories {
+	maven {
+            // Google Maven Repository
+            url 'https://maven.google.com'
+        }
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.3'
+        classpath 'com.android.tools.build:gradle:2.+'
         classpath 'com.google.gms:google-services:3.0.0'
     }
 }