Gradle and dependency updates.

build.gradle

@@ -5,12 +5,13 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.1'
     }
 }
 
 allprojects {
     repositories {
         jcenter()
     }
+    tasks.withType(Javadoc).all { enabled = false }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Sat Apr 22 01:25:33 EDT 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

sample/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-  compileSdkVersion 23
-  buildToolsVersion "23.0.1"
+  compileSdkVersion 25
+  buildToolsVersion "25.0.2"
 
   defaultConfig {
     applicationId "com.sromku.simple.fb.example"
     minSdkVersion 15
-    targetSdkVersion 23
+    targetSdkVersion 25
     versionCode 1
     versionName "1.0"
   }

simple-fb/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 23
+        targetSdkVersion 25
         versionName project.VERSION_NAME
         versionCode Integer.parseInt(project.VERSION_CODE)
         consumerProguardFiles 'consumer-proguard-rules.pro', 'gson.pro', 'simple-fb.pro'
@@ -33,7 +33,7 @@ ext {
     siteUrl = 'https://github.com/sromku/android-simple-facebook'
     gitUrl = 'https://github.com/sromku/android-simple-facebook.git'
 
-    libraryVersion = '4.1.1'
+    libraryVersion = '4.2.1'
 
     developerId = 'sromku'
     developerName = 'Roman Kushnarenko'
@@ -52,9 +52,9 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.0.0'
-        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'
-        classpath 'com.github.dcendents:android-maven-plugin:1.2'
+        classpath 'com.android.tools.build:gradle:2.3.1'
+        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4'
     }
 }
 
@@ -65,8 +65,7 @@ allprojects {
 }
 
 dependencies {
-    compile 'com.facebook.android:facebook-android-sdk:4.7.+'
-    // compile project(':facebook')
-    compile 'com.google.code.gson:gson:1.7.2'
+    compile 'com.facebook.android:facebook-android-sdk:4.22.0'
+    compile 'com.google.code.gson:gson:2.7'
 }
 

simple-fb/src/main/java/com/sromku/simple/fb/SimpleFacebookConfiguration.java

@@ -163,7 +163,7 @@ public static class Builder {
         private boolean mAllAtOnce = false;
         private boolean mUseAppsecretProof = false;
         private String mAppSecret = null;
-        private String mGraphVersion = ServerProtocol.getAPIVersion();
+        private String mGraphVersion = ServerProtocol.getDefaultAPIVersion();
 
         public Builder() {
         }

simple-fb/src/main/java/com/sromku/simple/fb/entities/Education.java

@@ -37,15 +37,15 @@ public class Education {
     private String mType;
 
     public String getSchool() {
-        return mSchool.getName();
+        return mSchool == null ? null : mSchool.getName();
     }
 
     public String getDegree() {
         return mDegree == null ? null : mDegree.getName();
     }
 
     public String getYear() {
-        return mYear.getName();
+        return mYear == null ? null : mYear.getName();
     }
 
     public List<String> getConcentrations() {