Updated to Builder 0.5.6

The new tools IAndroidTarget class manages version using a new class "AndroidVersion" https://android.googlesource.com/platform/tools/base/+/master/sdklib/src/main/java/com/android/sdklib/AndroidVersion.java

2 tests are failing right now
```java
AndroidSdkTest class
validPlatformsAndApiLevels()
{
    ...
    final AndroidSdk sdk4_1 = new AndroidSdk(new File(sdkTestSupport.getEnv_ANDROID_HOME()), "4.1.2");
}
```

```java
AbstractAndroidMojoTest class
givenNoPathThenUseAndroidHomePath()
```