Disable webdriver-jasmine:saucelabs_android test temporarily

The Android test suite is consistently failing with nonsensical error messages:
```
>> not ok 572 - vendor/immutable/__tests__/ImmutableObject-test
   ImmutableObject should create distinct object with deep field
   insertion:PROD.
   # Expected { oldShallowField : { newDeepField : 'hello' } } to equal
              { oldShallowField : { newDeepField : 'hello' } }.
```
Whatever the reason for this Android-specific SNAFU, it's not worth rendering our entire Travis test suite useless.

cc @subtleGradient