CB-7512 Use a standard build.gradle for all plugins

Plugins can extend it by providing a "build-extras.gradle"

bin/templates/cordova/lib/plugin-build.gradle

@@ -0,0 +1,63 @@
+/* Licensed to the Apache Software Foundation (ASF) under one
+   or more contributor license agreements.  See the NOTICE file
+   distributed with this work for additional information
+   regarding copyright ownership.  The ASF licenses this file
+   to you 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.
+*/
+
+// GENERATED FILE! DO NOT EDIT!
+
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.12.+'
+    }
+}
+
+apply plugin: 'android-library'
+
+dependencies {
+    compile fileTree(dir: 'libs', include: '*.jar')
+}
+
+android {
+    compileSdkVersion cordova.cordovaSdkVersion
+    buildToolsVersion cordova.cordovaBuildToolsVersion
+    publishNonDefault true
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
+
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            resources.srcDirs = ['src']
+            aidl.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            res.srcDirs = ['res']
+            assets.srcDirs = ['assets']
+            jniLibs.srcDirs = ['libs']
+        }
+    }
+}
+
+if (file('build-extras.gradle').exists()) {
+    apply from: 'build-extras.gradle'
+}