Fix broken builds on Android

[inakianduaga]

• Developer menu not showing was related to physical keyboard option in emulator being set incorrectly

• /app/build/generated/.../BuildConfig.java file has the following options

/**
 * Automatically generated file. DO NOT MODIFY
 */
package com.reactnativets;

public final class BuildConfig {
  public static final boolean DEBUG = Boolean.parseBoolean("true");
  public static final String APPLICATION_ID = "com.reactnativets";
  public static final String BUILD_TYPE = "debug";
  public static final String FLAVOR = "";
  public static final int VERSION_CODE = 1;
  public static final String VERSION_NAME = "1.0";
}

which shows that usually the app will run under on dev mode. It's automatically generated by the build process

• npm run android just runs cd android; ./gradlew installDebug

[inakianduaga]

Initial properties on Android:

http://stackoverflow.com/questions/34048387/react-native-initialproperties-android