Okhttp extension - Update gradle build

extensions/okhttp/build.gradle

@@ -1,3 +1,16 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 apply plugin: 'com.android.library'
 
 android{
@@ -19,17 +32,11 @@ android{
     lintOptions {
         abortOnError false
     }
-
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_7
-        targetCompatibility JavaVersion.VERSION_1_7
-    }
 }
 
 dependencies {
     compile project(':library')
-    compile('com.squareup.okhttp:okhttp:2.4.0') {
+    compile('com.squareup.okhttp:okhttp:2.5.0') {
         exclude group: 'org.json'
     }
-    compile 'com.android.support:support-annotations:23.0.0'
 }