Fixed android sample tests.

Upgrading to robotium 4.3.1 fixed this exception (when run on a 4.4 emulator):

```
java.lang.RuntimeException: java.lang.ClassCastException: java.util.ArrayList cannot be cast to android.view.View[]
at com.jayway.android.robotium.solo.Searcher.searchFor(Searcher.java:127)
at com.jayway.android.robotium.solo.Waiter.waitForText(Waiter.java:383)
at com.jayway.android.robotium.solo.Clicker.clickOn(Clicker.java:352)
at com.jayway.android.robotium.solo.Solo.clickOnButton(Solo.java:742)
at com.octo.android.sample.test.HelloAndroidActivityFestAndroidTest.testCompute(HelloAndroidActivityFestAndroidTest.java:25)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)
Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to android.view.View[]
at com.jayway.android.robotium.solo.ViewFetcher.getWindowDecorViews(ViewFetcher.java:389)
at com.jayway.android.robotium.solo.ViewFetcher.getAllViews(ViewFetcher.java:81)
at com.jayway.android.robotium.solo.ViewFetcher.getViews(ViewFetcher.java:189)
at com.jayway.android.robotium.solo.ViewFetcher.getCurrentViews(ViewFetcher.java:308)
at com.jayway.android.robotium.solo.ViewFetcher.getCurrentViews(ViewFetcher.java:295)
at com.jayway.android.robotium.solo.Searcher$1.call(Searcher.java:112)
at com.jayway.android.robotium.solo.Searcher$1.call(Searcher.java:106)
at com.jayway.android.robotium.solo.Searcher.searchFor(Searcher.java:203)
at com.jayway.android.robotium.solo.Searcher.searchFor(Searcher.java:125)
... 18 more
```