Clean up multidex gradle build, bump version to 1.0.2 for release

Bug: 36122649
Test: ./gradlew dist test connectedAndroidTest
Change-Id: I79578f683146a3ea16521cd090d113698a14c5f5
diff --git a/version.gradle b/version.gradle
new file mode 100644
index 0000000..d216a30
--- /dev/null
+++ b/version.gradle
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+ext.multidexVersion = '1.0.2'